肺癌病因至今虽尚未明确,但可能与吸烟、大气污染、放射性物质,职业危害、肺部慢性疾患等有关,特别是近年来大量研究证明,吸烟与肺癌关系密切。综合美国、加拿大、英国一百万以上人口的预计性调查结果,吸烟者的肺癌死亡比不吸烟者多10.8倍, Although the cause of lung cancer is not yet clear, it may be related to smoking, air pollution, radioactive substances, occupational hazards, chronic lung diseases, etc. In particular, a large number of studies in recent years have proved that smoking is closely related to lung cancer. Based on the predictive survey of more than one million people in the United States, Canada, and the United Kingdom, smokers have 10.8 times more lung cancer deaths than non-smokers.