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.