吸烟是导致肺癌的主要原因,全球约超过90%的男性肺癌患者和超过80%的女性肺癌患者是由于吸食**患癌。另外,被动吸烟也会导致肺癌。world cancer research fund/american institute for cancer research. diet, nutrition, physical activity and cancer: a global perspective. continuous update project expert report 2018. 20210311