吸烟对健康的危害很大,其中最主要的就是致癌。吸烟可导致肺癌。国内外的研究均表明,吸烟者致肺癌的危险性比非吸烟者高25倍,70～90%的肺癌与吸烟有关。香烟的烟气及焦油凝聚物中存在4,000种以上的化合物。其中多环芳烃(简称 PAH)类化合物达150种以上,证实具有致癌性的 PAH 为苯并[a]芘、二苯并[a、h]蒽、苯并[b]荧蒽等。此外,在烟草焦 Smoking is harmful to health. The most important one is cancer. Smoking can cause lung cancer. Studies at home and abroad have shown that smokers are 25 times more likely to develop lung cancer than non-smokers, and 70 to 90% of lung cancers are associated with smoking. There are more than 4,000 compounds in the smoke and tar condensate of cigarettes. Among them, there are more than 150 types of polycyclic aromatic hydrocarbons (abbreviated as PAH) compounds, and the PAHs that have been shown to be carcinogenic are benzo[a]pyrene, dibenzo[a,h]pyrene, benzo[b]fluoranthene and the like. In addition, the tobacco coke