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Many people even develop lung cancer< r="../." =" " ="" ="" /> due to second-hand smoke. For those who have a history of smoking, the age group with a high incidence of lung cancer is 1-year-old. < ="_"> < ="" =""> <>There are many risk factors for lung cancer. The medical community now speculates that lung cancer should be a multi-factorial disease. The synergistic effect of a large number of carcinogens and carcinogens in cigarettes can damage normal cells in the lungs and increase the risk of lung cancer. Long-term exposure to high concentrations of radon and radon progeny is closely related to the occurrence of lung cancer and should arouse everyone's great attention. <>In addition, the large amounts of coal, diesel, gasoline burned every day in cities, as well as the paving of asphalt roads and the exhaust from motor vehicles can cause air pollution in densely populated areas. Low immunity, endocrine disorders, depression and family inheritance may lead to the occurrence of lung cancer. People engaged in occupations such as foundry, rubber production, printing, welding, construction, painting, production and application of certain pesticides, oil refining, etc. may inhale toxic substances during the operation. Therefore, the lung cancer rate of people engaged in these occupations is higher than that of other occupations. . If industrial waste gas is not treated properly, it will pollute the environment and atmosphere in factories and mines. There is a radioactive natural substance called radon that has been listed as an important indoor carcinogen by the International Agency for Research on Cancer. <>Diet and nutrition are important components of carcinogenic environmental factors. Nutritional status can lead to cancer through genetic changes, especially vitamins and essential amino acids. The level of pollutants in the air is directly proportional to the probability of developing lung cancer. Because the smoke produced by burning cigarettes contains at least one harmful component. People engaged in some highly polluting occupations may be exposed to carcinogens that cause or promote the occurrence and development of lung cancer during work and labor. This substance is widely found in building decoration materials. The lack of these nutrients can change the genetic material, leading to genetic changes and cancer. The fumes produced when burning coal for heating or cooking food under poor indoor ventilation conditions are also carcinogenic. <>Mr. Wen Xingyu, a performing artist who recently died of lung cancer, was also confirmed by relatives and friends that he loved to smoke and almost never left his hand