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5月间日是“世界无烟日”，世界卫生组织向全球烟民发出警告：烟草是人类合法的毒品，吸烟中毒是一种流行病。一、烟害一支香烟至少可产生500毫升烟雾，其中有几千种带有刺激性和毒性的物质，主要有尼古丁、（7O、焦油和多种有毒的物质。尼古丁是引起人类烟浪的物质，是无色微
May Day is the “World No Tobacco Day,” and the World Health Organization warns smokers around the world that tobacco is a legitimate drug for humans and that smoking poisoning is an epidemic. 1. Smoke A cigarette can produce at least 500 millilitres of smoke, of which there are thousands of substances that are irritant and toxic, mainly nicotine, (7O, tar, and a variety of toxic substances. Nicotine is caused by human smoke Substance, colorless micro