I started smoking when I was 16. When I turned 20 I said whenever I turn 25 and if I'm still smoking I will quit. Well when I got pregnant with our son I quit, I was 20 then. 2 weeks after he was born I caught myself doing it again. 1 week before my 25th birthday, which was this past January, I just up and quit! And have been smoke free ever since. My husband still does it but he's been very considerate to go outside whenever he does.

I guess that I had it stuck in my head so long that I would not smoke passed that date that I felt I couldn't let myself down. You could try something similar but not so long term. I shouldn't have waited so long, but I did. Hope I could help someone