食品家族的“孽子”——烟草

The vile spawn of food family--tobacco

本文扼要介绍了烟草的原产地、发现史及其传入中国的历史过程，概括地叙述了500年来人们对烟草的化学成分和生理效应的研究结果，并且从文化的角度阐述了人们明知吸烟有害健康但却仍然乐此不疲的原因。

This article explain the main points briefly tobacco＇ s original place of production, history of discover and spread of China. Summeraiz relate tobacco＇s research achievement of chemical composition and physiological action in 500 years. Moreover, from cultural angle explain the public know perfectly well smoke endanger health. But, the public still like smoke. Why？