The incidence of lung cancer is rising rapidly! In the past 30 years, the mortality rate of lung cancer has increased by 465%, and the incidence rate has increased by 26.9% per year, replacing liver cancer as the first cause of malignant tumor death in China. Tumors related to the ecological environment and lifestyle, such as lung cancer, liver cancer, colorectal cancer, breast cancer, bladder cancer mortality rate has shown a sustained growth momentum, especially lung cancer has the largest increase. According to the information provided by the National Tumor Prevention and Control Office of the Ministry of Health, between 2000 and 2005, the number of lung cancer patients in China increased by 120,000, of which the number of male lung cancer patients increased from 260,000 to 330,000 in 2005, and the number of female lung cancer patients increased from 120,000 to 170,000 during the same period. Who is the real culprit of lung cancer? Why is the number of lung cancer patients in China rising so fast? Smoking and air pollution are the main “culprits” of lung cancer. There are thousands of chemicals and hundreds of harmful substances in tobacco, and there are 69 kinds of substances known to be related to lung cancer or cancer. The longer you are exposed to tobacco and the more you are exposed to it, the higher your chances of getting sick. The smoking index for lung cancer is the number of cigarettes smoked per day multiplied by the number of years of smoking. If the number of cigarettes smoked per day multiplied by the number of years of smoking is greater than 400, then you are at high risk for lung cancer. Air pollution is divided into two types: outdoor air pollution: such as automobile exhaust, wind and sand, chemical petroleum coal residue particles, etc.; indoor air pollution: such as second-hand smoke, third-hand smoke, kitchen fumes and indoor decoration materials, etc., which is also an important factor in exceeding the PM2.5 standard. In recent years in China non-smoking women’s lung adenocarcinoma rising rate is obvious, in addition to second-hand smoke, third-hand smoke, kitchen pollution and house decoration materials pollution there are more reasons, including atmospheric pollution, environmental factors, psychological factors and so on, which is also a new topic in the field of lung cancer research at present. Don’t smoke is something you can do now! Under the superimposed influence of air pollution and other factors, the incidence of lung cancer is getting higher and higher, in which lung cancer patients in many cities including Nanjing have become the number one cancer killer. According to research, directly related to smoking squamous and small cell lung cancer patients accounted for 30% -40%, and this part of the lung cancer, 90% of the people are heavy smokers, the age of the cigarette is generally greater than 20 packs of years, that is, a pack of cigarettes a day smoking for 20 years. Therefore, we are concerned about the haze pollution, do not forget to smoke this lung cancer culprits. Lung cancer is so fierce to do a good job of three-tier prevention for different groups of people recommended “three-tier prevention” program: the first level of prevention that is the cause of the prevention, for the healthy population, mainly including: 1, do not smoke, away from second-hand smoke; 2, eat more grains, vegetables, fruits and potatoes; 3, as far as possible, to avoid outdoor polluted air and kitchen fumes; 4, the use of environmentally friendly decoration materials; 5 to maintain optimism, and the use of environmentally friendly decoration materials; 5 to keep optimistic about the future of lung cancer. Environmentally friendly decoration materials; 5 to maintain an optimistic attitude towards life. Secondary prevention, i.e. early diagnosis and treatment, is aimed at high-risk groups. The high-risk groups of lung cancer include: 1) history of smoking and smoking index is more than 400 cigarettes/year; 2) history of exposure to high-risk occupations (such as exposure to asbestos); 3) family history of lung cancer; and 4) people over 45 years old. Lung cancer can be detected early through screening. Some countries target smokers over the age of 45, some countries target smokers over the age of 50, and some countries target smokers over the age of 55, which are selected according to the incidence of lung cancer and high-risk groups in different countries. If you live in an area with a high incidence of lung cancer, belong to a high-risk group for lung cancer, have a family history of tumors, and have occupational risk factors for cancer, even if you don’t get into the screening program of the state or local government, you should participate in a health checkup once a year, and do a low-dose helical CT examination of the chest during the checkup.” Tertiary prevention, i.e., rehabilitative prevention, is aimed at lung cancer patients, who must follow the doctor’s instructions to go to the hospital for rechecking, take various means to prevent deterioration, recurrence and metastasis, prolong the survival period and improve the quality of life of patients, and promote rehabilitation.