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It is said that about half of people in China smoke。 Many young boys and girls have the habit of smoking， though they are middle school students。

As we all know， smoking does great harm to human beings。 More and more people have come to realize how serious this problem is。 But they are never bored with it。 Some people think it is a kind of fashion， some think it is of great fun and others think that smoking can refresh themselves。

Smoking causes many illnesses。 A lot of people always cough because of smoking。 The most serious illness caused by smoking is lung cancer。 Meanwhile smoking is a waste of money。 Besides， careless smokers may cause dangerous fires。

In order to keep healthy， we should get rid of the bad habit of smoking。 Please stop smoking at once。