Wiix, I can relate - it took me a long time (many attempts) to quit.

Two things helped me:

(1) Nicotine patches (prescribed by my GP) - I started on a fairly high dose and tapered off over a few months under medical supervision.

(2) A spread-sheet which I used to keep track of the money that I saved by not smoking. Every so often I would use some of that money for a treat (a nice restaurant meal, a book that I always wanted, etc).

I still use that spread-sheet - it helps me to stay motivated.