Getting on wellbutrin, (bupropion) was the only way for me. Go to your doctor ask for it, it is a wonderful antidepressant with a side effect of not wanting a cigarette. I quit within a week of taking it and stayed on it for a year. It also gives you a great energy boost and you lose weight too. I had quit many times by myself prior, but always started back up again. This was the easiest and less stressful way I tried, I also have no desire for a cigarette since. Smoking is so bad for your body, you realize how much better you feel when you quit and you want to keep that feeling.
I wish you the best!