What do you think of smoking?and offer your reasons.

Smoiking is a very bad habit,but nowadays more and more people are becoming smokers,even heavy smokers.I'm completely against smoking.
Firstly the cigarettes contain nicotine which can cause cancer.When someone smokes in the public places,it will not only do great harm to the smokers itself but also to the people around.Secondly,it’s a waste of money which becomes a heavy burden to his family.Last,smoking is a source of pollution.