why do we smoke?

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I am a smoker, i started smoking wen i was let down by my friends a breach of trust you may say then i used to smoke 1 cigarette a day then after 3 months there were ma xamzzz wen the daily rate shot up to 6/day from then the rate is undulating according to typr of mood am into.Why is it we smoke inspite of knowing all the harm it does personally i smoke cos itzzzzzz a method to easy relaxation .Plz respond and is there any other healthier way to substitute the smoke.