Lung cancer is preventable and can be controlled. Studies have shown that the incidence and mortality rates of lung cancer have decreased significantly in recent years in western countries through tobacco control and environmental protection. Prevention of lung cancer can be divided into three levels of prevention. 1. Primary prevention: (1) Prohibition and control of smoking A large number of studies have proved that smoking is the main factor causing lung cancer. Research proves that quitting smoking can significantly reduce the incidence of lung cancer, and the earlier you quit smoking, the more obvious the reduction of lung cancer incidence. Therefore, quitting smoking is the most effective way to prevent lung cancer. Smoking should be banned immediately for those who smoke. The country should enact strong laws and publicize that tobacco contains carcinogenic substances that cause lung cancer in order to reduce the harm of passive smoking. (2) Protect the environment Atmospheric pollution is an important lung cancer-causing factor, among which there are mainly 3,4-dumb pyrene, sulfur dioxide, nitrogen oxide and carbon monoxide. The exposure dose of atmospheric pollution, deposition index, smog index, benzopyrene, etc. is positively correlated with the incidence of lung cancer, so protecting the environment and reducing atmospheric pollution are important measures to reduce the incidence of lung cancer. The measures are as follows: a. Restrict the development of urban motor vehicles, improve the combustion equipment of motor vehicles, and reduce the emission of toxic gases. b. Research on harmless energy sources, and gradually replace or eliminate Those harmful energy sources. c. Improve indoor ventilation equipment to reduce harmful substances in the small environment. (3) Prevention of occupational factors Exposure to carcinogens such as dust and asbestos in many occupations can increase the incidence of lung cancer. a. Workers in dust-polluted environments should wear masks or other protective masks to reduce the inhalation of harmful substances. b. Improve the ventilation of the workplace to reduce the concentration of harmful substances in the air. c. Transform the production (4) Scientific diet (4) Scientific diet Diet should be rich in nutrition, vitamin A and D. Fresh vegetables and fruits should be eaten more often, which has certain effect on preventing lung cancer. 2.Secondary prevention: It refers to the screening and early diagnosis of lung cancer to achieve early diagnosis and treatment of lung cancer. Lung examination should be done regularly for long-term smokers, especially for high-risk smokers over 45 years old, and patients suffering from chronic bronchitis, emphysema and old tuberculosis, etc. Low-dose chest CT scan is recommended to help detect early lung cancer lesions. Sputum exfoliative cytology examination is also feasible. 3.Tertiary prevention: for rehabilitation prevention. After lung cancer patients have achieved complete or partial remission after surgical resection, radiotherapy or Chinese and Western medicine anti-cancer drug treatment, attention should be paid in promoting recovery. The main things to do are: (1) completely prohibit smoking; (2) do qigong exercises, especially those to enhance respiratory function, so as to improve lung function; (3) pay attention to the fresh air in the environment and go to the natural environment for exercise or activities more often. (4) Eat less stimulating foods and more foods rich in vitamin A and D, etc. 5. Maintain a good mood. If you are in partial remission, you should do the necessary Chinese and Western medical treatment under the close observation of your doctor in order to strive for long-term remission.