吸烟的坏处英文版
吸烟的危害英语作文
吸烟的危害英语作文关于吸烟的危害英语作文7篇无论是在学校还是在社会中，大家对作文都不陌生吧，作文是从内部言语向外部言语的过渡，即从经过压缩的简要的、自己能明白的语言，向开展的、具有规范语法结构的、能为他人所理解的外部语言形式的转化。
那么，怎么去写作文呢？以下是小编整理的吸烟的危害英语作文7篇，供大家参考借鉴，希望可以帮助到有需要的朋友。
吸烟的危害英语作文篇1The majority of people would agree that cigarette smoking has caused serious problems. But the tobacco companies insist that they contribute greatly to the world economy by paying taxes to the government and employing hundreds of workers.Personally, I believe that cigarette production and consumption threatens to do more harm than good. Firstly, smoking is responsible for many fatal diseases such as lung cancer, heart diseases and so on. According to the survey, tobacco consumers account for about 20% of the world population, and among them, three million people die from smoking-related diseases every year. The fact that the output of tobacco production is reduced from 143.64 billion pounds in 1994 to 142 billion pounds in 1995 also suggests that people have come to realize the negative effects of smoking. Secondly, tobacco consumption is extremely wasteful of money. As is indicated in the pictures, 200 billion US dollars is lost due to smoking each year. Obviously, the total loss of money around the globe substantially exceeds the gain in the industry.In conclusion, as the economic development aims at making our life better, we cannot sacrifice our health for short-term financial benefits. If we have to spend more and more moneyproviding medical services for those who suffer from smoking-related illnesses, the notion of promoting economy via tobacco production is not justifiable. It is high time that we fought for the total tobacco ban.吸烟的危害英语作文篇2As we all know, there are many people smoking, although everyone knows smoking is harmful to us. Giving up smoking is not easy but addicted to it is quite easy, that’s why there are more and more people smoking. Smoking and passive smoking is risk factor that leads to various diseases.It has become world’s top 8 causes of death. More than 90% of lung cancer caused by smoking and lung cancer rates of smokers are 18 times over the non-smokers. Besides, smoking also causes angiocardiopathy, digestive system disease, oral disease and so on. In addition, passive smoking causes great concern in recent years.People have known that passive smoking also do great harm to human, too. Therefore, many countries and regions prohibit people from smoking in public zones, in order to reduce the harm of secondhand smoke.From my point of view, the best way to keep healthy is giving up smoke, for smoker’s own good as well as for others.翻译：众所周知，即使人们都知道吸烟有害健康，但现在依然有很多人吸烟。
关于吸烟的危害作文英文
关于吸烟的危害作文英文Title: The Detrimental Effects of Smoking。
Smoking is a perilous habit that has plagued societies worldwide for decades, posing severe health risks and societal burdens. Despite widespread awareness campaignsand stringent regulations, the detrimental effects of smoking persist, impacting individuals, families, and communities. In this essay, we delve into the multifaceted dangers of smoking and its profound implications on public health and well-being.First and foremost, smoking is unequivocally linked toa myriad of health complications, ranging from respiratory ailments to life-threatening diseases. Inhalation oftobacco smoke exposes the body to a potent cocktail oftoxic chemicals, including carcinogens such as tar and formaldehyde. These harmful substances infiltrate the lungs, causing inflammation, impaired lung function, andincreasing the risk of developing conditions such aschronic obstructive pulmonary disease (COPD), emphysema, and lung cancer. Moreover, smoking is a leading cause of cardiovascular diseases, including coronary artery disease, stroke, and peripheral vascular disease, as it elevates blood pressure, accelerates atherosclerosis, and diminishes overall cardiovascular health.Furthermore, the adverse effects of smoking extend beyond individual health to encompass broader societal repercussions. The economic burden of tobacco-related healthcare costs and productivity losses is staggering, straining healthcare systems and hindering economic development. Moreover, secondhand smoke exposure poses a significant threat to non-smokers, particularly vulnerable populations such as children and pregnant women. Inhalation of secondhand smoke increases the risk of respiratory infections, asthma exacerbations, sudden infant death syndrome (SIDS), and low birth weight infants, underscoring the need for comprehensive smoke-free policies to safeguard public health.In addition to its physical toll, smoking exerts aprofound social and psychological impact on individuals and communities. Nicotine addiction perpetuates a vicious cycle of dependence, withdrawal, and relapse, undermining efforts to quit smoking and perpetuating the cycle of addiction. Moreover, smoking is often intertwined with social norms, cultural practices, and peer influences, perpetuating its prevalence and normalization within certain demographics and communities. The stigma associated with smoking can also exacerbate feelings of isolation, shame, and discrimination among smokers, hindering their access to support services and cessation resources.Despite these daunting challenges, concerted efforts to combat smoking have yielded promising progress in reducing smoking rates and mitigating its adverse effects. Comprehensive tobacco control measures, including tobacco taxation, smoke-free laws, advertising restrictions, and cessation support services, have proven effective in curbing smoking prevalence and promoting public health. Moreover, public awareness campaigns, school-based prevention programs, and tobacco cessation interventions play a pivotal role in educating individuals about thedangers of smoking and empowering them to make informed choices about their health and well-being.In conclusion, smoking remains a pressing public health issue with far-reaching consequences for individuals, families, and societies at large. From its devastating impact on physical health to its social and economic ramifications, smoking exacts a heavy toll on public health and well-being. By adopting a multifaceted approach that combines regulatory measures, education, and cessation support, we can mitigate the harms of smoking, promote healthier lifestyles, and build smoke-free communities for future generations to thrive.。
吸烟的坏处的英语作文
吸烟的坏处的英语作文Smoking is a harmful habit that has been around for centuries. Despite the numerous warnings and health risks associated with smoking, many people continue to smoke. The harmful effects of smoking are well documented and can have serious consequences on a person's health.Firstly, smoking can cause cancer. Smoking is the leading cause of lung cancer, accounting for 85% of all cases. The chemicals in cigarettes can damage the DNA in cells, leading to the development of cancer. Other types of cancer that can be caused by smoking include throat, mouth, bladder, and kidney cancer.Secondly, smoking can damage the respiratory system. Smoking can cause chronic bronchitis, emphysema, and other respiratory diseases. These conditions can make itdifficult to breathe and can lead to a decreased quality of life. Smoking can also exacerbate asthma symptoms and increase the risk of pneumonia.Thirdly, smoking can increase the risk of heart disease. Smoking can damage the lining of the arteries, leading to the buildup of plaque. This can cause the arteries to narrow, leading to an increased risk of heart attack and stroke. Smoking can also increase blood pressure and heart rate, further increasing the risk of heart disease.In addition to the health risks, smoking can also have social and financial consequences. Smoking can lead tosocial isolation, as many people do not want to be around smokers. Smoking can also be expensive, with the cost of cigarettes increasing every year.In conclusion, smoking is a harmful habit that can have serious consequences on a person's health. The risks of smoking are well documented and should not be ignored. Quitting smoking can be difficult, but it is never too late to quit. By quitting smoking, a person can improve their health, increase their quality of life, and reduce theirrisk of developing serious health conditions.。
吸烟的坏处英文版
1.One, smoking cause thrombus, cause all kinds of heart diseaseInhaled cigarette smoke of carbon monoxide reduces the ability of blood oxygen .Nicotine can rapid heartbeat, high blood pressure, reduce the heart's ability towithstand, myocardial ischemia caused by coronary artery infarction, cardiacischemia (or angina) promote adenoma accumulation, many heart disease begins to happen.Between 30 and 49 years old, smokers heart incidence rate is very high, is five times that of non-smokers. Smokers found that after one year of their heart disease risk by half.Two, smoking on the brain damageSmoking can cause a variety of brain diseases, may reduce the brain of oxygen and blood circulation, causing brain hemorrhage and occlusion of blood vessels, resultingin paralysis, dementia and stroke. Stroke due to smoking induced brainvascular spasm, make easier blood clotting. The risk of stroke in smokers thannon-smokers two times.Three, the damage of smoking on oralSmoking can cause oral cancer and laryngeal cancer. The tar and smoke cigarettes in the heat will cause inflammation of the salivary glands, impaired taste and smell the taste buds, greatly reduced the ability. Next, it is easy to cause oral cancer, approximately 2/3 of patients found in oral cancer can be difficult to live. At the same time, can makethe throat of flue gas temperature increases from 37 ° C to 42 ° C, cause micro degree burn inside the mucosa resulting from chronic heat trauma, and finally to laryngeal carcinoma.Four, smoking on lung damageSmoking can cause bronchial epithelium cilia shorter and irregular and disorder and movement , reduce the local resistance, susceptible to infection. Smoking can cause lung cancer. 90% of the total mortality caused by smoking. Initial symptoms can not be detected, until the cancer cells spread to the blood vessels and other organs. Smoking also causes emphysema, lung bronchial accumulation of toxic substances, willprevent the air inhaled and exhaled normally, cause lung cell expansion or burst, resulting in the sick difficulty breathing.Five, smoking damage to the stomachPersons suffering from gastrointestinal diseases, smoking enough for gastroenterology deteriorate. Suffering from gastric ulcer or duodenal ulcer, ulcer healing will slowdown, and even evolve into chronic disease. Smoking can stimulate the nervous system, accelerate the secretion of saliva and gastric juice, gastrointestinal tension often, resulting in loss of appetite smokers. In addition, nicotine causes vasoconstriction of the gastrointestinal mucosa, and the appetite.Harm six, smoking on the whole skeletonNicotine causes vasoconstriction, reducing blood flow to the new bone. Smoking inhalation of carbon monoxide, and also to reduce the ratio of oxygen into thebody. Smoking can cause pelvic inflammation and pain, severe back pain part of the National People's Congress has great smokers, this is because smoking can cause reduced blood flow to auricular disc, auricular disc and thus an earlydegradation. Smoking can cause arthritis. Smoking a packet of cigarettes a day ,will increase the prevalence rate of 50%. Smoking causes faster bone loss. Smokingcan interfere with estrogen, but estrogen is an important hormone bone development. Seven, smoking on liver damageSmoking will increase the burden of the liver. Regular smoking can affect the lipid metabolism of liver, so that the blood fat, reduce cholesterol to benign, malignant cholesterol increases. The causes of the liver detoxification function and increase the burden.Eight, smoking on intestinal damageSmoking causes cancer of the colon. This opportunity is suffering from cancer is proportional to the quantity of tobacco smoking. Although studies have shown that stopping smoking can reduce other diseases such as heart disease, lung cancer and other opportunities, but the risk of suffering from colon cancer is still very large.Nine, the damage of smoking on reproductive systemSmoking onspinal nerve central inhibition, the smoking man sexual weak ,because smokingcan make blood vessel contraction, spasm, causing peripheral blood circulation disorder. Smoking is the main cause of impotence. Australia and Canada have on cigarette box local printed directly on this information. In addition, the effect of smoking on sperm motility, abnormal sperm increased; stop smoking three to six months, before returning to normal. If you want a smart, healthy child, baby experts’ advocate must stop smoking three to six months.Harm ten, second-hand smokeSmoke the smoke may be distributed more than four thousand kinds of gases and particulate matter, most of these substances are very strong stimuli, including atleast forty can cause cancer in human or animal body. In the smoker to stop smoking, these particles can still stay in the air for several hours, can be othernon-smokers inhale the body, may also decay products of radon gas mixedtogether, cause greater harm to human health.Smokers when smoking is hazardous to their health at the same time, secondhand smoke also affects non smokers. In addition to irritate the eye, nose and throat, it will significantly increase non-smokers suffering from lung cancer and heart disease theopportunity. If children live with a number of smokers, respiratory system, they would be more susceptible to infection. Other effects includeincreased cough, asthma, phlegm, lung function damage mitigation and lung development.From: China quit network2. Harmful ingredients , and harm of tobacco smoke.Process smokers inhaled cigarette, the cigarette in incomplete combustion process and thermal chemical reaction synthesis of a series of thermal decomposition, the formation of a large number of new material, its chemical composition is very complex, the separation of harmful components of more than 3000 species from the smoke, the main toxic substances as nicotine (nicotine, tobacco tar,) carbon monoxide, hydrogencyanide, ammonia and aromatic compounds and other toxic substances.1) nicotine. Nicotine is a smell, taste bitter, colorless transparent oily liquid, volatile strong, easily oxidized into dark gray in the air, can be quickly dissolved in waterand alcohol, through the mouth, nose, bronchial mucosa easily absorbed by thebody. Viscosity is absorbed into the body in nicotine can the skin surface, is a drugthat can make people addicted to. A cigarette contains nicotine can kill amuse, 20 nicotine in cigarettes can kill a cow. Human lethal dose is 50-70 mg ,equivalent tothe content of 20-25 in cigarette nicotine. There are two typical examples can illustrate this problem: healthy 40 year old British man a long-term smoking, engaged in a very important work, night smoke 14 cigars and 40 cigarettes, morning feel uncomfortable, the doctor rescue is invalid die. Another example is: France held a smoking contest winner in a club, he smoked 60 cigarettes, the future and the podium is dead, the other competitors in the competition for the dying, to the hospital.So, why the daily cigarette smoking box (20) many more people, includingnicotine content greatly surpass the lethal dose, but acute poisoning deaths rarely? The reason is part of the nicotine in tobacco smoke is toxic formaldehyde in and out, but most are not continuous smoking, the nicotine is discontinuous slowly into the human body. In addition, cigarettes lit 50% nicotine with smoke diffusion into the air, 5% with cigarette butts thrown away, 25% were burning damage, only 20% is absorbed by the human body. And nicotine in vivo was soon detoxifications are excreted in the urine. Coupled with the long-term smokers, the body produces certain tolerance to nicotine, therefore the occurrence of acute poisoning phenomenon less harm, which makes manypeople ignore and continue to smoke cigarettes.2) tar. Is composed of several kinds of material mixed into, in the lungs will be concentrated into a viscous, carcinogenic substances. -- that is to say, it cancause cancer, in which contact with the organization therefore, smokers of any part of therespiratory tract (including oral and throat) has the possibility of canceroccurrence. Smoking 15 to 20 cigarettes a day, it is easy to suffer from lung cancer, oral cancer or laryngeal cancer risk of death, 14 times larger than people not tosmoke. Usually, the respiratory tract can swing a nap on the lung, continuous particles and bacteria swept into the formation of phlegm mucus and their discharge, and of the chemicals in tobacco smoke in addition to cancer, but also the gradual destructionof the respiratory tract of the vile, increased mucus secretion, bacteria long time remained in the lung, the lung the occurrence of chronic disease, susceptible to bronchitis. Smokers cough is due to the mechanical performance of clean lungs had been damaged, and the sputum volume increased. In addition, the cell membrane tar will directly damage the alveolar epithelial cells, and destroy the cell membrane permeability, will eventually lead to emphysema. This is the main reason for smoking can lead to chronic bronchitis and emphysema.3) carbon monoxide . Very easy with the red cell hemoglobin binding, causes red blood cells to reduce the oxygen carrying capacity, thus increasing the burden on theheart, causing heart attacks, a serious cause of death.Smoking is harmful to the human health by following a set of data may be better able to explain the problem:85% of all lung cancer cases are caused by smoking;In oral cancer, 50%-70% associated with smoking;In the kidney and bladder cancer associated with smoking, 30%-40%;10% of sudden infant death caused by passive smoking.Of people living with smokers, the risk of lung cancer is 6 times more than ordinary people;3.。
吸烟的坏处英文作文
吸烟的坏处英文作文英文：Smoking is a bad habit that can cause serious health problems. As a smoker myself, I know firsthand the negative effects of smoking. Firstly, smoking can damage your lungs and lead to lung cancer. This is because cigarettes contain harmful chemicals such as tar and nicotine, which can cause inflammation and scarring in the lungs. Secondly, smoking can increase the risk of heart disease and stroke. Nicotine in cigarettes can cause the blood vessels to narrow, which can lead to high blood pressure and increase the risk of heart attack and stroke. Lastly, smoking can also affect your appearance. It can cause yellowing of the teeth, bad breath, and premature aging of the skin.Despite knowing all these negative effects, it can be difficult to quit smoking. Nicotine is highly addictive, and quitting can cause withdrawal symptoms such as irritability, anxiety, and cravings. However, quittingsmoking is important for your health. There are many resources available to help smokers quit, such as nicotine replacement therapy, support groups, and counseling.In conclusion, smoking is a bad habit with serioushealth consequences. As a smoker, I know how hard it can be to quit, but it is important to try for the sake of your health.中文：吸烟是一种不良习惯，会导致严重的健康问题。
吸烟的害处-英语作文
吸烟的害处-英语作文Smoking is a harmful habit that can cause numerous health problems. It not only affects the smoker but also those around them. The consequences of smoking are severe and can lead to various diseases and even death.Firstly, smoking can damage the respiratory system. It can cause chronic bronchitis, emphysema, and lung cancer. The harmful chemicals in cigarettes can irritate and inflame the airways, making it difficult to breathe. Smokers often suffer from coughing, wheezing, and shortness of breath. In severe cases, smoking can lead to respiratory failure and death.Secondly, smoking can have a negative impact on cardiovascular health. It increases the risk of heart disease, stroke, and high blood pressure. The toxins in cigarettes can damage the blood vessels, leading to the build-up of plaque and narrowing of the arteries. This restricts blood flow and oxygen supply to the heart, increasing the chances of a heart attack or stroke.Furthermore, smoking can harm the reproductive system. It can cause infertility, erectile dysfunction, and complications during pregnancy. The toxic chemicals in cigarettes can affect the quality andquantity of sperm, making it difficult for couples to conceive. In pregnant women, smoking increases the risk of premature birth, low birth weight, and developmental issues in the baby.Additionally, smoking can damage the oral health. It can cause bad breath, stained teeth, and gum disease. The chemicals in cigarettes can irritate the gums, leading to inflammation and infection. Smokers are also at a higher risk of developing oral cancer, which can be life-threatening.Moreover, smoking can accelerate the aging process and cause premature wrinkles. The toxins in cigarettes can damage the collagen and elastin fibers in the skin, leading to sagging and wrinkling. Smokers often have dull and dry skin, and their wounds take longer to heal.In conclusion, smoking is a dangerous habit with numerous harmful effects. It damages the respiratory system, cardiovascular health, reproductive system, oral health, and accelerates aging. Quitting smoking is essential for improving overall health and preventing serious diseases. It is never too late to quit and make a positive change for a healthier life.。
香烟的坏处英文作文
香烟的坏处英文作文英文：Smoking is a bad habit that can cause a lot of harm to our health. As a smoker myself, I know firsthand the negative effects of smoking. It can lead to lung cancer, heart disease, and a host of other health problems.One of the main reasons smoking is so harmful is because it contains thousands of harmful chemicals. These chemicals can damage our lungs and other organs, leading to serious health problems down the road. In addition, smoking can also affect our appearance, causing premature aging and wrinkles.Another major problem with smoking is the addiction it creates. Nicotine, the main ingredient in cigarettes, is highly addictive and can be very difficult to quit. Many smokers find themselves unable to quit even when they know it's bad for their health.Despite all of these negative effects, smoking is still a very popular habit around the world. Many people continue to smoke despite the risks, often because they enjoy the social aspect of smoking or find it helps them relax.Overall, smoking is a very harmful habit that can have serious long-term effects on our health. If you're a smoker, I encourage you to consider quitting and seek help if needed.中文：吸烟是一种坏习惯，会对我们的健康造成很大的伤害。
吸烟的危害5条简短英语
吸烟的危害5条简短英语
1. 吸烟会增加患上肺癌、心脏病和中风等疾病的风险。
2. 吸烟会导致肺部和呼吸系统的损害，引起呼吸困难和气喘等问题。
3. 吸烟会影响嗅觉和味觉的功能，同时也会导致口腔和牙齿的问题。
4. 吸烟会导致皮肤老化和皮肤病，如皮肤癌和湿疹等。
5. 吸烟会对身体健康造成长期影响，并降低寿命。
1. Smoking increases the risk of developing diseases such as lung cancer, heart disease, and stroke.
2. Smoking damages the lungs and respiratory system, causing breathing difficulties and asthma.
3. Smoking affects the sense of smell and taste, and also causes oral and dental problems.
4. Smoking causes skin aging and skin diseases such as skin cancer and eczema.
5. Smoking has long-term effects on health and reduces lifespan.。
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1.One, smoking cause thrombus, cause all kinds of heart diseaseInhaled cigarette smoke of carbon monoxide reduces the ability of blood oxygen .Nicotine can rapid heartbeat, high blood pressure, reduce the heart's ability towithstand, myocardial ischemia caused by coronary artery infarction, cardiacischemia (or angina) promote adenoma accumulation, many heart disease begins to happen.Between 30 and 49 years old, smokers heart incidence rate is very high, is five times that of non-smokers. Smokers found that after one year of their heart disease risk by half.Two, smoking on the brain damageSmoking can cause a variety of brain diseases, may reduce the brain of oxygen and blood circulation, causing brain hemorrhage and occlusion of blood vessels, resultingin paralysis, dementia and stroke. Stroke due to smoking induced brainvascular spasm, make easier blood clotting. The risk of stroke in smokers thannon-smokers two times.Three, the damage of smoking on oralSmoking can cause oral cancer and laryngeal cancer. The tar and smoke cigarettes in the heat will cause inflammation of the salivary glands, impaired taste and smell the taste buds, greatly reduced the ability. Next, it is easy to cause oral cancer, approximately 2/3 of patients found in oral cancer can be difficult to live. At the same time, can makethe throat of flue gas temperature increases from 37 ° C to 42 ° C, cause micro degree burn inside the mucosa resulting from chronic heat trauma, and finally to laryngeal carcinoma.Four, smoking on lung damageSmoking can cause bronchial epithelium cilia shorter and irregular and disorder and movement , reduce the local resistance, susceptible to infection. Smoking can cause lung cancer. 90% of the total mortality caused by smoking. Initial symptoms can not be detected, until the cancer cells spread to the blood vessels and other organs. Smoking also causes emphysema, lung bronchial accumulation of toxic substances, willprevent the air inhaled and exhaled normally, cause lung cell expansion or burst, resulting in the sick difficulty breathing.Five, smoking damage to the stomachPersons suffering from gastrointestinal diseases, smoking enough for gastroenterology deteriorate. Suffering from gastric ulcer or duodenal ulcer, ulcer healing will slowdown, and even evolve into chronic disease. Smoking can stimulate the nervous system, accelerate the secretion of saliva and gastric juice, gastrointestinal tension often, resulting in loss of appetite smokers. In addition, nicotine causes vasoconstriction of the gastrointestinal mucosa, and the appetite.Harm six, smoking on the whole skeletonNicotine causes vasoconstriction, reducing blood flow to the new bone. Smoking inhalation of carbon monoxide, and also to reduce the ratio of oxygen into thebody. Smoking can cause pelvic inflammation and pain, severe back pain part of the National People's Congress has great smokers, this is because smoking can cause reduced blood flow to auricular disc, auricular disc and thus an earlydegradation. Smoking can cause arthritis. Smoking a packet of cigarettes a day ,will increase the prevalence rate of 50%. Smoking causes faster bone loss. Smokingcan interfere with estrogen, but estrogen is an important hormone bone development. Seven, smoking on liver damageSmoking will increase the burden of the liver. Regular smoking can affect the lipid metabolism of liver, so that the blood fat, reduce cholesterol to benign, malignant cholesterol increases. The causes of the liver detoxification function and increase the burden.Eight, smoking on intestinal damageSmoking causes cancer of the colon. This opportunity is suffering from cancer is proportional to the quantity of tobacco smoking. Although studies have shown that stopping smoking can reduce other diseases such as heart disease, lung cancer and other opportunities, but the risk of suffering from colon cancer is still very large.Nine, the damage of smoking on reproductive systemSmoking onspinal nerve central inhibition, the smoking man sexual weak ,because smokingcan make blood vessel contraction, spasm, causing peripheral blood circulation disorder. Smoking is the main cause of impotence. Australia and Canada have on cigarette box local printed directly on this information. In addition, the effect of smoking on sperm motility, abnormal sperm increased; stop smoking three to six months, before returning to normal. If you want a smart, healthy child, baby experts’ advocate must stop smoking three to six months.Harm ten, second-hand smokeSmoke the smoke may be distributed more than four thousand kinds of gases and particulate matter, most of these substances are very strong stimuli, including atleast forty can cause cancer in human or animal body. In the smoker to stop smoking, these particles can still stay in the air for several hours, can be othernon-smokers inhale the body, may also decay products of radon gas mixedtogether, cause greater harm to human health.Smokers when smoking is hazardous to their health at the same time, secondhand smoke also affects non smokers. In addition to irritate the eye, nose and throat, it will significantly increase non-smokers suffering from lung cancer and heart disease theopportunity. If children live with a number of smokers, respiratory system, they would be more susceptible to infection. Other effects includeincreased cough, asthma, phlegm, lung function damage mitigation and lung development.From: China quit network2. Harmful ingredients , and harm of tobacco smoke.Process smokers inhaled cigarette, the cigarette in incomplete combustion process and thermal chemical reaction synthesis of a series of thermal decomposition, the formation of a large number of new material, its chemical composition is very complex, the separation of harmful components of more than 3000 species from the smoke, the main toxic substances as nicotine (nicotine, tobacco tar,) carbon monoxide, hydrogencyanide, ammonia and aromatic compounds and other toxic substances.1) nicotine. Nicotine is a smell, taste bitter, colorless transparent oily liquid, volatile strong, easily oxidized into dark gray in the air, can be quickly dissolved in waterand alcohol, through the mouth, nose, bronchial mucosa easily absorbed by thebody. Viscosity is absorbed into the body in nicotine can the skin surface, is a drugthat can make people addicted to. A cigarette contains nicotine can kill amuse, 20 nicotine in cigarettes can kill a cow. Human lethal dose is 50-70 mg ,equivalent tothe content of 20-25 in cigarette nicotine. There are two typical examples can illustrate this problem: healthy 40 year old British man a long-term smoking, engaged in a very important work, night smoke 14 cigars and 40 cigarettes, morning feel uncomfortable, the doctor rescue is invalid die. Another example is: France held a smoking contest winner in a club, he smoked 60 cigarettes, the future and the podium is dead, the other competitors in the competition for the dying, to the hospital.So, why the daily cigarette smoking box (20) many more people, includingnicotine content greatly surpass the lethal dose, but acute poisoning deaths rarely? The reason is part of the nicotine in tobacco smoke is toxic formaldehyde in and out, but most are not continuous smoking, the nicotine is discontinuous slowly into the human body. In addition, cigarettes lit 50% nicotine with smoke diffusion into the air, 5% with cigarette butts thrown away, 25% were burning damage, only 20% is absorbed by the human body. And nicotine in vivo was soon detoxifications are excreted in the urine. Coupled with the long-term smokers, the body produces certain tolerance to nicotine, therefore the occurrence of acute poisoning phenomenon less harm, which makes manypeople ignore and continue to smoke cigarettes.2) tar. Is composed of several kinds of material mixed into, in the lungs will be concentrated into a viscous, carcinogenic substances. -- that is to say, it cancause cancer, in which contact with the organization therefore, smokers of any part of therespiratory tract (including oral and throat) has the possibility of canceroccurrence. Smoking 15 to 20 cigarettes a day, it is easy to suffer from lung cancer, oral cancer or laryngeal cancer risk of death, 14 times larger than people not tosmoke. Usually, the respiratory tract can swing a nap on the lung, continuous particles and bacteria swept into the formation of phlegm mucus and their discharge, and of the chemicals in tobacco smoke in addition to cancer, but also the gradual destructionof the respiratory tract of the vile, increased mucus secretion, bacteria long time remained in the lung, the lung the occurrence of chronic disease, susceptible to bronchitis. Smokers cough is due to the mechanical performance of clean lungs had been damaged, and the sputum volume increased. In addition, the cell membrane tar will directly damage the alveolar epithelial cells, and destroy the cell membrane permeability, will eventually lead to emphysema. This is the main reason for smoking can lead to chronic bronchitis and emphysema.3) carbon monoxide . Very easy with the red cell hemoglobin binding, causes red blood cells to reduce the oxygen carrying capacity, thus increasing the burden on theheart, causing heart attacks, a serious cause of death.Smoking is harmful to the human health by following a set of data may be better able to explain the problem:85% of all lung cancer cases are caused by smoking;In oral cancer, 50%-70% associated with smoking;In the kidney and bladder cancer associated with smoking, 30%-40%;10% of sudden infant death caused by passive smoking.Of people living with smokers, the risk of lung cancer is 6 times more than ordinary people;3.。