Zyban - 

after taking it for a few weeks the desire to smoke just evaported for me .

I did do have to go through it twice , but only because I quit taking the Zyban as soon as I quit smoking.

Tjhis time I stayed with the Zyban (also known as Wellbutrin) and have been smoke free since January.

It was effortless to quit.  To stay quit......that's the trick.

Good Luck

Rogertick