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Smoking， which may be a pleasure for some people， is a series of discomforts for their fellows。 Medicai scientists have expressed their concern about the effect of smoking on the health not only of
those who are smoking but also of those who live in the air polluted by tobacco smoke。 And studies show that non-smokers suffer more than the smokers themselves。
A great number of students have joined in trying to persuade the university to forbid smoking。 Smoking is not allowed in theatres， cinemas and in other public places。 Therefore，smoking must be forbidden in our classrooms。
Although many people have passed away for having smoked a lot and we call on people to give up smoking， yet many more will turn down what we say every day。 I think it more important to call on the smoker to use good judgment and to show concern for others。