The history of human smoking dates back to the days of ancient Greece. But the earliest record of smoking is a stone carving of a smoking old man on an ancient temple in Mexico in 442 A.D., indicating that human beings started smoking more than 1,600 years ago. And tobacco in China was introduced during the Wanli period of the Ming Dynasty. Smoking and lung cancer a cigarette lit smoke, containing more than 3,000 kinds of toxic and harmful chemicals, the most important of which are nicotine, carbon monoxide, cyanide, the presence of a variety of carcinogenic substances in the smoke tar, radioactive isotopes and heavy metal elements. Tobacco combustion of carcinogenic substances produced by benzopyrene, nitrosamines, β-naphthylamine, cadmium, radioactive polonium and so on. There are also phenolic compounds and other cancer-promoting substances. Smoking is internationally recognized as one of the most important factors causing lung cancer. The death of smokers due to lung cancer is about 10 times more than that of non-smokers. In China, 70%~80% of male lung cancer is caused by smoking, and about 30% of female lung cancer is attributed to smoking and passive smoking. The earlier the age of smoking, the greater the risk of lung cancer. The mortality rate of lung cancer in people who have smoked for 60 years is about 100 times higher than that in people who have smoked for 20 years. Smoking age is directly proportional to the incidence of lung cancer. Smoking index of more than 400 years of cigarettes (the product of the number of years of smoking and the average number of cigarettes smoked per day) is a danger signal, such as a young man, who started smoking at the age of 15, smoking a packet a day, not to the age of 35~40, may get lung cancer. Misconceptions about smoking cessation 1, smoking with filters and low nicotine, low-tar cigarettes (the so-called low-risk cigarettes) can reduce the harm or no harm. Obviously, this is self-assurance. It is clinically found that the incidence of squamous cell carcinoma in male lung cancer patients has decreased, but the incidence of lung adenocarcinoma is increasing, which may be related to the addition of filters. Due to the addictive nature of nicotine patients will smoke more tobacco to fulfill their body’s needs. As a result, more cigarettes are smoked.2. You cannot quit smoking suddenly or you will be prone to lung cancer. This is obviously wrong. It takes more than 10 years of smoking cessation for the incidence of lung cancer to drop to roughly the same level as that of non-smokers. Many smokers take the initiative to quit smoking willpower is not strong, after quitting smoking rate is very high, these people really do not smoke, often due to the lack of a pleasant sense of smoking and passive quitting, then the smoker’s body may be by the problems that need to be seriously examined. 3, I have been smoking for many years, to have a problem early, and some people smoke for a lifetime is also fine? The relationship between smoking and cancer is a chronic process, generally up to more than 20 years, so there are always smokers who take a chance. Foreign countries have done a lot of epidemiological surveys and found that 20 to 30 years after smoking is the period of high incidence of smoking-related diseases. It’s never too late to quit smoking.4. If quitting is unsuccessful, you’ll smoke more instead. It is normal to start smoking again after quitting; it is part of the quitting process. Usually quitters go through an average of four serious attempts to quit before they succeed. It doesn’t matter if you don’t succeed the first time, as long as you keep trying again and again. Each new attempt increases your chances of quitting successfully. As long as you keep at it, you will be able to succeed and get rid of “cigarettes” completely, without the phenomenon of smoking more and more. In our clinical work, we found that many old smokers in the malignant tumor, naturally stopped smoking, and does not require human supervision and intervention, very consciously quit smoking, and even some smokers smoke more than three packs a day. This shows that when life is seriously threatened by tobacco, when choosing between life and tobacco, tobacco is given up without hesitation, but it is often too late. So there is no reason why we can’t quit smoking early when we are healthy and say goodbye to this bad habit. on January 24, 2013, the New England Journal of Medicine published an article that according to a survey of more than 200,000 people in the U.S., smokers have a three times higher mortality rate than never-smokers (stemming from smoking-related tumors, cardiovascular and respiratory diseases), and life expectancy is 10 years shorter. However, you can make up those 10 years if you quit smoking before age 35, and you can get 6 years back if you quit before age 55. Smokers undergo beneficial changes after quitting, with lung cancer death rates decreasing over 5 years compared to the average smoker (one pack per day) or nearly as much as non-smokers. The incidence of oral, respiratory, and esophageal cancers drops to half the incidence of smokers. within 10 years, precancerous cells are replaced by healthy ones. The incidence of lung cancer drops to roughly the same rate as non-smokers after 10 years of smoking cessation. To cherish life and prevent cancer, start from quitting smoking.