We all know that smoking is harmful to health. The incidence and death of tumors in China is increasing year by year. Tumors are divided into benign and malignant, and malignant tumors are commonly known as cancer. Lung cancer, breast cancer, liver cancer and stomach cancer are among the top of the list of malignant tumor incidence and death. The World Health Organization recently released a report stating that in 2012, there were 2.2 million cancer deaths in China, with an average of 1 in 4 deaths due to cancer, and the highest incidence of cancer is lung cancer, which is directly related to the large number of smokers in China! Another report shows that about 100,000 people die each year from diseases related to secondhand smoke. According to the information provided by the National Cancer Prevention and Treatment Research Office of the Ministry of Health, it is predicted that the number of lung cancer cases in China will increase by 120,000 between 2000 and 2005, from 260,000 in 2000 to 330,000 in 2005 for men, an increase of 26.9%; and from 120,000 to 170,000 for women. By 2025, China will have 1 million lung cancer patients, making it the world’s number one lung cancer country. “The mortality rate of lung cancer in China was 7/100,000 in the early 1970s and 17.5/100,000 in the early 1990s, while the figure is now 40/100,000. Compared to 30 years ago, the lung cancer mortality rate has increased five times.” The high incidence of lung cancer is mainly related to smoking, environmental pollution, poor lifestyle, high pace of life and other factors, of which smoking is the main “killer” and 90% of lung cancers are related to smoking. Research results show that the incidence of lung cancer is ten times higher in smokers than in non-smokers, and if the current smoking situation in China remains unchanged, nearly 100 million men between the ages of 0 and 29 will die from smoking by 2050 in middle age or old age. The number of female deaths will also reach millions, and with a current smoking rate of 33.5% for people over 15 years of age, it is estimated that by 2025, about 2 million people will die each year from smoking-related diseases in China! Although the reasons for the increase in lung cancer are complex, domestic and international studies have confirmed that smoking, chemical and radioactive pollution, kitchen fume pollution and indoor and car environmental pollution are important causes of lung cancer. Research results show that the incidence of lung cancer is 10 times higher among smokers than non-smokers; children from smoking families are 2.8 times more likely to develop lung cancer than children from non-smoking families. Currently, quitting smoking and controlling environmental pollution are effective means of preventing lung cancer. Although not all lung cancers are caused by tobacco, smoking is still the biggest risk factor, and quitting smoking can reduce the likelihood of developing lung cancer. According to a follow-up survey on smoking cessation, the incidence of lung cancer tends to decrease gradually after quitting. Within 1 to 3 years of quitting, the incidence of lung cancer decreased by about 1/10; after 6 years of quitting, the incidence of lung cancer decreased by more than half; after 15 years of quitting, the incidence of lung cancer was similar to that of nonsmokers. The risk of lung cancer in heavy smokers (15 cigarettes or more per day) decreases significantly after reducing the amount of cigarettes smoked by half, and the mortality rate of lung cancer decreases after stopping smoking. Stopping smoking may prolong survival and reduce the recurrence rate of lung cancer. Quitting smoking at age 35 to 39 years increases life expectancy by 5 years for men and by 3 years for women at the same age. Quitting smoking, even after age 60, increased life expectancy for both men and women. Because the lung cancer that nonsmokers have has some completely new pathological features, they are more effective in responding to some therapies, especially some targeted therapies that have emerged in recent years. Therefore, for the health of you and your family, an effective smoking cessation program (and more importantly, the elimination of smoking) is needed to stay away from smoking! What’s more, we should prevent lung cancer in the details of life and prevent occupational lung cancer; increase the intake of vegetables and fruits in food, especially more food rich in carotene, vitamin C, vitamin E, folic acid and trace elements of selenium, etc., which can also reduce the incidence of lung cancer.