经常吸烟罹患肺癌的机会大大提高。医学界认为,导致肺癌的因素很多,包括吸烟、高苯环境、石棉及烟氧环境等。长期吸烟刺激损害了喉咙和气管的黏膜,引发多痰、多咳和慢性气管炎等,使支气管和肺泡壁失去弹性,通气功能下降。而烟气中的亚硝胺、稠环芳烃苯等物质也可直接或间接致癌。吸烟对身体有害,大多数烟民都知道这一点,但主动戒烟并戒烟成功者并 The chances of smoking lung cancer often increase greatly. The medical profession believes that many factors lead to lung cancer, including smoking, high benzene environment, asbestos and smoke and oxygen environment. Long-term smoking and irritation damage to the mucous membranes of the throat and trachea, triggering phlegm, cough and chronic bronchitis, bronchial and alveolar wall loss of elasticity, decreased ventilation. The flue gas nitrosamines, polycyclic aromatic hydrocarbons benzene and other substances can also be directly or indirectly carcinogenic. Smoking is bad for the body, and most smokers know that, but those who voluntarily quit and quit smoking are