Alcohol.......Smoke..........is it really that bad??

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My parents came to know about my habit of drinking alcohol. And from then I got a nice scolding for that. I ask you all people, is it really bad to drink or to smoke?? I mean if it is in a limit then its not gonna harm anyone. Will it? I have stopped drinking for the sake of my parents but then also this question is bugging me out. Have any suggestion or advice for it????