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烟草的烟雾中含有的主要对人体有害的化学物质是焦油、尼古丁和一氧化碳。焦油是由好几种物质混合而成的物质。尼古丁是一种会使人成瘾的物质,由肺部吸收,主要是对神经系统发生作用。一氧化碳能降低红血球将氧输送到全身去的能力。以下是吸烟对身体主要部位的危害。
The main harmful chemicals in tobacco smoke are tar, nicotine and carbon monoxide. Tar is a mixture of several substances. Nicotine is an addictive substance that is absorbed by the lungs, mainly acting on the nervous system. Carbon monoxide reduces the ability of red blood cells to deliver oxygen to the body. The following are the hazards of smoking on the main parts of the body.