Tobacco smoke contains at least three kinds of dangerous chemicals: the tar, nicotine and carbon monoxide, tar is made up of several kinds of material blending material, will be concentrated into a viscous material in the lungs. Nicotine is a drug can make people addiction, absorbed by the lungs, mainly ACTS on the nervous system. Carbon monoxide can reduce red blood cells carry oxygen around the body to ability.
A 15 to 20 cigarettes a day, the susceptibility to lung cancer, cancer of the mouth or throat cancer death risk, than the people do not smoke 14 times; Its susceptibility to esophageal cancer death machine spinning 4 times than nonsmokers, National People's Congress; Died in the big two times the risk of bladder cancer; The risk of dying from heart disease is twice as big. Smoking is the leading cause of chronic bronchitis and emphysema, and ?
烟草的烟雾中至少含有三种危险的化学物质：焦油，尼古丁和一氧化碳，焦油是由好几种物质混合成的物质，在肺中会浓缩成一种粘性物质。尼古丁是一种会使人成瘾的药物，由肺部吸收，主要是对神经系统发生作用。一氧化碳能减低红血球将氧输送到全身去能力。
一个每天吸15到20支香烟的人，其易患肺癌，口腔癌或喉癌致死的机率，要比不吸烟的人大14倍；其易患食道癌致死的机纺比不吸烟的人大4倍；死于膀胱癌的机率要大两倍；死于心脏病的机率也要大两倍。吸香烟是导致慢性支气管炎和肺气肿的主要原因，而慢性肺部疾病本身，也增加了得肺炎及心脏病的危险，并且吸烟也增加了高血压的危险。
