科学家们的研究证明,吸烟对人体危害很大.由于香烟燃烧时能产生一氧化碳、甲烷、二氧化氮、硫化氢、3,4苯并芘等几十种有害气体和极强的致癌物质,污染空气.因此,不仅毒害吸烟者本人,而且会使许多人受害.近年来,戒烟的呼声越来越高.有些国家在法律上明文规定,禁止去公共场合吸烟.戒 Scientists have proved that smoking is harmful to the human body.Due to the combustion of cigarettes can produce dozens of harmful gases such as carbon monoxide, methane, nitrogen dioxide, hydrogen sulfide, 3,4-benzopyrene and so on, and strong carcinogens, pollution Air, therefore, not only poison smokers themselves, but also many people will suffer in recent years, smoking cries louder and louder, some countries legally expressly prohibit smoking in public.