肺癌在增长!据统计:肺癌发病率已居恶性肿瘤的第二位,男性肺癌死亡率较女性高。要预防肺癌,必须了解肺癌的病因。其致病之源主要与下列因素有关。(一)吸烟:有9种癌症与吸烟关系密切,其中尤以肺癌为首位。吸烟者肺癌的发生率比不吸烟者高4—65倍。纸烟燃烧的烟雾中含有苯并芘,亚硝胺、尼古丁等致癌物 Lung cancer is growing! According to statistics, the incidence of lung cancer has ranked second in malignant tumors, and male lung cancer mortality is higher than that of women. To prevent lung cancer, you must understand the cause of lung cancer. The source of the disease is mainly related to the following factors. (1) Smoking: There are 9 kinds of cancers that are closely related to smoking, especially lung cancer. The incidence of lung cancer in smokers is 4-65 times higher than non-smokers. Smoke from paper smoke contains benzopyrene, nitrosamines, nicotine and other carcinogens