A. Prohibition and control of smoking: The mechanism of lung cancer caused by smoking has now been studied more clearly, epidemiological data and a large number of animal experiments have completely proved that smoking is the main factor causing lung cancer. Now on the issue of smoking ban is discussed as follows. 1.Smoking should be banned immediately. 2, the country should make strong laws to promote tobacco contains carcinogenic substances that cause lung cancer. 3.To reduce the hazards of passive smoking. Second, to reduce the hazards of industrial pollution: the following aspects should be started. 1, in the dust pollution environment workers, should bring a good mask or other protective masks to reduce the inhalation of harmful substances. 2.Improve the ventilation environment of the workplace to reduce the concentration of harmful substances in the air. 3.Reform the production process to reduce the production of harmful substances. Reduce environmental pollution: Atmospheric pollution is an important lung cancer-causing factor. Among them, there are mainly 3,4-dumb pyrene, sulfur dioxide, nitrogen oxide and carbon monoxide. Reduce environmental pollution and measures are as follows: 1, limit the development of urban motor vehicles, improve the combustion equipment of motor vehicles, reduce the emission of toxic gases. 2, research on harmless energy, gradually replace or eliminate those harmful energy. 3.Improve indoor ventilation equipment to reduce harmful substances in the small environment. 4, in the spiritual aspect, to keep the spirit of cheerful upward, not for some small things and sullen. 5, diet should be rich in nutrition, vitamin A, D, should eat more fresh vegetables and fruits.