Exercise
根据提示用英语写一篇短文（词数限在130—150之间）。
提示：许多人认为饭后抽烟是一种享受，他们认为人在疲劳和困倦时，抽烟可以提神。实际上，抽烟害处很大。首先，医生和科学家认为抽烟有害于人体健康，可以引起多种疾病，如心脏病和肺癌。抽烟污染了空气，对人的健康不利。其次，许多大的火灾是由于抽烟者的过失而引起的。同时，烟价昂贵，每年花费很大，这是一种惊人的浪费。这就是为什么越来越多的人要戒烟的原因。
参考范文
Smoking Is a Bad Habit
Many people smoke because they think that smoking is an enjoyment，especially after meals．They also believe that when one feels tired or sleepy during work，it is refeshing to have a smoke．
In fact，smoking is a very bad habit．First，doctors and scientists have found that it is harmful to the smoker's health．It may cause some serious diseases，such as heart trouble or cancer．Smoking will pollute the air and is also harmful to the other's health．Second，many big fires have been caused by careless smokers．These have resulted in loses of lives and property．
Besides，cigarettes are usually very expensive and smokers have to spend a lot of money on them every year．So smoking is waste．
That is why more and more smokers are trying their best to give up smoking．
