You cannot stop smoking directly because it has many related things, implications. You are tense, and if you stop smoking you will start something else and the other may be more harmful. Don't go on escaping problems, face them. The problem is that you are tense, so the goal should be how to be non-tense, not, smoking or not smoking. Meditate. Relax your tensions without any object into the sky, allow catharsis to happen. When you are non-tense these things will become absurd, foolish, and they will drop. Food will change, your styles of living will change.