We all know that smoking may lead to lung cancer, while an unfamiliar gas “radon gas” is the second major cause of lung cancer besides tobacco. Radon gas is a kind of radioactive gas, which is colorless and odorless, and its specific gravity is 7.5 times that of air. If you live in the basement or first floor, the probability of inhaling radon gas will be relatively more. Available data show that 20% of lung cancer worldwide is closely related to radon gas. Polluted concrete, cement, marble and granite are the main sources of radon gas. In addition, substances such as asbestos and benzene, which are inhaled by human body for a long time, will also lead to lung cancer. For this reason, experts suggest that air purifiers can be used at home to bring down the concentration of particulate matter in the home; proper window opening and ventilation are also necessary measures to keep good indoor air. According to statistics, the incidence of tumors in smokers is 7 to 11 times higher than that of non-smokers, especially lung cancer is more closely related to smoking, about 80% of lung cancer patients are caused by long-term smoking. The polycyclic aromatic hydrocarbons in cigarettes are likely to induce lung cancer It has been found that cigarettes release thousands of harmful substances during combustion, dozens of which are strong carcinogens, such as polycyclic aromatic hydrocarbon chemicals represented by benzopyrene contained in tar. Benzo(a)pyrene is a strong carcinogenic and lethal agent, and a very small dose can cause cancer and death in experimental animals. Nicotine, which we are familiar with, has little to do with cancer, but it is a trigger for cardiovascular disease and peptic ulcers, and should not be underestimated. Smoking is accompanied by the release of radioactive substances from the smoke, which exposes the body, especially the mucous membranes of the airways and lung tissues, to adhesion and radiation. Tobacco is susceptible to impurities and mold during various stages, including storage and production, which can also lead to the development of certain tumors. Smoking and atmospheric pollution have another synergistic effect in the process of carcinogenesis, and the effects of smoking plus haze catalyze the development of lung cancer. In addition, smoking itself is a source of pollution that affects the healthy people around it. Household fumes also increase the incidence of lung cancer Household cooking fumes are the main source of pollution in the kitchen environment. Women have more opportunities to cook and are easily attacked by smoke. If canola oil is used for stir-frying and frying food, it will emit fumes containing chemical mutagenic substances; or poor quality oil that has been stored for too long, which contains free fatty acids, aldehydes and ketones, and when the oil temperature reaches a certain level, it is easy to volatilize fumes containing many harmful substances, and these fumes particles have been tested to be carcinogenic. Investigations have shown that this etiology is particularly prominent among middle-aged and elderly female lung cancer patients, with risk factors three times higher than those of normal people. However, these hazards are a slow, long-term, lung cancer-causing factor that does not attract widespread attention from society and women.