Since the 1980s, the incidence of lung cancer has been gradually increasing and has become the world’s number one malignant tumor in terms of both incidence and mortality, which is considered the top cancer. Although people have recognized the causes of lung cancer, it is not so easy to avoid its occurrence. The words “smoking is harmful to health” sound like nothing new, and it can be said that more than 90 percent of smokers are familiar with the dangers of smoking, but how many of them will have the urgency to quit smoking? In the past 20 years, the number of smokers in China is gradually climbing, the average number of Chinese men smoking per day has reached 1945 British figures predict that the number of smoking-related deaths in China in 1987 was 100,000, into 2025 there will be more than 2 million deaths from smoking. The worrying thing is that there are currently 300 million “smokers” in China, and there is an increasing trend of youth smoking, as long as the production and sale of tobacco is legal. These figures are based on the standard of living and health awareness of people today, but the majority of smokers still do not have the drive to quit or not to smoke. There are many tobacco sellers and some smokers believe that smoking has nothing to do with the length of a person’s life, Mao Zedong and Deng Xiaoping all smoked and they lived longer than the average person, and Deng Xiaoping lived more than 90 years. These examples above seem to be very convincing. However, when we analyze them carefully, we can see that there is nothing scientific about such examples. First of all, the number of people who die from lung diseases caused by smoking is much higher than the number of non-smokers who suffer from lung diseases. Second, one of the major causes of death in the later years of Mao Zedong and Deng Xiaoping was pneumonia and emphysema, both of which were related to smoking. Finally, individual differences, living environments, and levels of health care may lead to different lengths of life for smokers. The level of health care enjoyed by heads of state is not comparable to that of the general population, and Deng Xiaoping had good exercise habits from his youth, while most people did not. Scientific studies in recent decades have confirmed the causal relationship between smoking and lung cancer, which has become conclusive, with 70% to 90% of lung cancers occurring as a result of smoking. The smoke produced by lit tobacco contains tobacco tar, commonly known as tobacco oil, which has significant carcinogenic and cancer-promoting effects. Carcinogens in tobacco tar include benzo(a)pyrene, benzanthracene, nitrosamines, polonium 210, cadmium, arsenic and other toxic and harmful substances that can damage normal cells and turn them into cancer cells, leading to cancer. The other harmful components in tobacco can cause damage to the endothelium of the heart and brain vessels, leading to the appearance of diseases in the corresponding areas. In addition to active smoking leading to their own health problems, secondhand smoke from smoking is also seriously endangering the health of the smoker’s family and colleagues. Husbands who smoke affect their wives, children, and even pregnant women. For example, the wife of a smoker has a 1-2 times higher risk of lung cancer than the wife of a non-smoker, and the children of a smoker have a several times higher risk of respiratory disease. This shows that smoking is not only harmful to yourself, but also to your family. Therefore, smokers should stop making the excuse that “smoking is my own business and no one else has any control over it”. In addition to the concern for middle-aged smokers who have been smoking for a long time, the problem of youth smoking deserves our attention. For young smokers, the younger they smoke, the greater the damage to lung tissue and the higher the risk of developing lung cancer in the future. Studies have shown that the younger the smoker, the more difficult it is to quit later. Since lung cancer caused by smoking does not appear until several years later, the addiction to smoking is gradually being “nurtured”. Therefore, discouraging young people from smoking before the age of 20 will not only help them to quit, but will also help to reduce smoking rates in the country as a whole and indirectly reduce the incidence of lung cancer in the future. Many smokers fail in their own attempts to quit, leading to a setback in their confidence to quit smoking, with the mistaken belief that quitting relies on perseverance, and that it is impossible to quit with insufficient perseverance. In fact, this is a misconception. It is good to rely on perseverance to quit smoking, but you also need to rely on the help of a professional smoking cessation doctor to guide the right way to quit smoking in order to achieve easy and effective quitting. In conclusion, smoking can lead to lung cancer is not something that will happen in a day or two, just as quantitative changes will one day produce qualitative changes, quit smoking before it is too late not only to help yourself, but also to help your family. Now you have the right to choose.