I don't smoke at all! But I have to tell you that 3 weeks ago I went to a club with a friend of mine and I smoked half a pack of cigarettes. After that I told myself that I didn't need any cigarette to "survive". Indeed, I didn't smoke any cigarette after I left the club that morning. You just need self discipline, nothing more. Always think of the discipline that characterizes totalitarian regimes. In this way, you can save yourself from a lot of nasty things, trust me.
By the way, if you liked my piece of advice, upvote my comment.
Thanks man. You do not need to ask for upvotes, if someone like your comment will upvote it :)