The causes of lung cancer are still not fully understood, but the following factors are known to increase the risk of the disease: i. Smoking Most lung cancers occur in people who smoke or have smoked before. Smoking damages lung cells and triggers abnormal cell growth. Long-term and heavy smokers have a higher risk of developing lung cancer than other smokers. Regular exposure to other people’s smoking, whether paper cigarettes, cigars or pipes, increases the risk of lung cancer, even if you don’t smoke. Atmospheric pollution One of the very important reasons for the increasing incidence of lung cancer is the development of global industrialization, which has led to increasingly serious atmospheric pollution and deterioration of air quality, such as the release of harmful carcinogenic gases such as 3,4-benzenepropylene from industrial fuels such as coal and oil, and a large amount of automobile exhaust. The incidence of lung cancer is high in industrially developed countries, higher in urban than rural areas, and higher in factory and mining areas than residential areas. Occupational factors Occupational exposure to asbestos substances in construction, asbestos mining, insulation processing, automobile brake repair, etc. If asbestos fibers are inhaled, these fibers will stimulate and damage lung tissue. Many studies have shown that asbestos exposure significantly increases the risk of developing lung cancer. In addition, industrial chemicals that have been recognized as carcinogenic include: long-term exposure to radioactive substances such as uranium, radium and their derivatives, carcinogenic hydrocarbons, arsenic, chromium, nickel, copper, tin, iron, coal tar, asphalt, and petroleum. Chronic diseases of the lung, such as tuberculosis, silicosis, and pneumoconiosis, often coexist with lung cancer, and some inflammatory lesions and pulmonary fiber scar lesions in the lung stimulate the lung tissue and increase the cancer rate. V. Intrinsic factors Family genetics, lowered immune function, metabolic activities and endocrine dysfunction may also play a role in promoting the development of lung cancer. Lung cancer is not contagious. Cancer cells need a specific environment in the human body to grow and reproduce, and they will die rapidly after leaving this environment and being discharged from the body. The cancer cell lines used in scientific research are cultured into viability only under a variety of specific nutrients and conditions.
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