Everyone knows that smoking is harmful to health. The incidence of tumors and deaths in China are increasing year by year. There are benign and malignant tumors, and malignant tumors are commonly known as cancer. Lung cancer, breast cancer, liver cancer and stomach cancer are at the top of the list of incidence and death of malignant tumors. The World Health Organization recently released a report pointing out that in 2012, there were 2.2 million cancer deaths in China, and on average, for every 4 deaths, 1 person died of cancer, and the cancer with the highest incidence is lung cancer, which is directly related to the large number of smokers in China! Another report shows that about 100,000 people die every year from diseases related to secondhand smoke. According to the information provided by the National Tumor Prevention and Control Research Office of the Ministry of Health, it is predicted that between 2000 and 2005, the number of lung cancer cases in China will increase by 120,000, from 260,000 in 2000 to 330,000 in 2005 for males, an increase of 26.9%; and from 120,000 to 170,000 for females. By 2025, the number of lung cancer patients in China will reach one million, becoming 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 40/100,000 now. Compared with 30 years ago, the mortality rate of lung cancer has increased fivefold. The high incidence of lung cancer is mainly related to smoking, environmental pollution, poor lifestyle, high tempo life and other factors, among which smoking is the main “killer” and 90% of lung cancer is related to smoking. Research results show that the incidence of lung cancer is ten times higher in smokers than in non-smokers. If the current smoking situation in China remains unchanged, then, by 2050, nearly 100 million men between the ages of 0 and 29 will die of smoking in their middle or old age. The number of female deaths will also be in the millions, and with the current smoking rate among people over 15 years of age in China being as high as 33.5%, it is estimated that by 2025, about 2 million people in China will die each year from smoking-related diseases! Although the reasons for the increase in lung cancer are complex, studies at home and abroad have confirmed that smoking, chemical and radioactive pollution, kitchen fume pollution and indoor and vehicle environmental pollution are important causes of lung cancer. Research results show that the incidence of lung cancer is 10 times higher in smokers than in non-smokers; children of smoking families are 2.8 times more likely to suffer from lung cancer than children of non-smoking families. Currently, quitting smoking and controlling environmental pollution are effective means of preventing lung cancer. Although not all lung cancer is caused by tobacco, smoking is still the biggest risk factor, and quitting smoking can reduce the possibility of lung cancer. According to a follow-up survey on smoking cessation, the incidence of lung cancer gradually declined after quitting smoking. Within 1~3 years of quitting smoking, the incidence of lung cancer decreases by about 1/10; after 6 years of quitting smoking, the incidence of lung cancer decreases by more than half; after 15 years of quitting smoking, the incidence of lung cancer is similar to that of non-smokers. Heavy smokers (more than 15 cigarettes a day) have a significantly lower risk of lung cancer after reducing their smoking by half, and the mortality rate of lung cancer decreases after stopping smoking; after 10 years of quitting smoking, the incidence of lung cancer decreases to roughly the same level as that of nonsmokers. The incidence of lung cancer after 10 years of smoking cessation is roughly the same as that of non-smokers. Stopping smoking may prolong survival and reduce the recurrence rate of lung cancer. Men who quit smoking between the ages of 35 and 39 can increase their life expectancy by five years, and women who quit at the same age can increase their life expectancy by three years. For both men and women, quitting even after age 60 increases their life expectancy. Because the lung cancers that nonsmokers develop have some entirely new pathologic features, they are much more effective in responding to some therapies, especially some of the targeted therapies that have emerged in recent years. Therefore, for the sake of your and your family’s health, carry out an effective smoking cessation program (more importantly, eliminate smoking) please stay away from smoking! What’s more, it is necessary to prevent the occurrence of lung cancer at the details of life, prevent occupational lung cancer; increase the intake of vegetables and fruits in food, especially eat more food rich in carotene, vitamin C, vitamin E, folic acid, trace element selenium, etc., which can also reduce the incidence rate of lung cancer.