Smoking is a bad habit that does a lot of harm to human health. Cigarette smoking does great harm to human health. In many cases, cigarette has proved to be the direct cause of such a fatal disease as cancer-hence its nickname, Cancer Stick. Experts say that smoking one cigarette can reduce ones life by about 15 minutes and that chain smoking is far more hazardous. Recent findings of medical research show that even a tiny drop of nicotine can kill a large animal like a horse. Some medical reports have also proved that heavy smoking would seriously affect an adults sexuality, and smoking after a meal also disturbs ones digestive system. Cigarette smoking not only jeopardizes the physical health of a smoker, it also affects the health of a nonsmoker who passively inhales the polluted air into his or her lungs when he or she is exposed to a winding shroud of cigarette smoke. The impact on such passive smokers , according to the experts in the medical field, can be even more damaging, and that is why smoking is usually prohibited in most public places.
议论文中常用的词句与短语
一.数据对比用语：
1. are similar in their range of indicators
2. cause / lead to a rapid / slow increase / decrease in the number / amount of
3. cause to drop
4. climb dramatically fromto
5. constitutes aboutpercent
6. continue to rise / fall
7. continue to widen / shorten
8. declines to less than percent.
9. drop / fall to as many / much / little as
10. fall / rise / increase / decrease dramatically
11. fluctuates between
12. grow only marginally fromto
13. increase / decrease slowly
14. increase/ decrease lightly
15. is doubled
16. is inversely proportional to
17. is significantly lower / higher than
18. lead to an increased number / amount of
19. level off / remain constant at
20. lower the percentage of
21. maintain approximately the same number of
22. narrow down to
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