Speaking from experience, the trick is to read the Allen Carr book. If you read it properly, by the end of it you will not WANT to smoke any more - the urge will have gone and it will not be a case of needing willpower.
I gave up 8 months ago and yes, I fancied a ciggie for the first couple of weeks but it wasn't the craving I was used to; it was more like the feeling you get when you fancy a cream cake, ie one would be nice, but you don't stress if you can't have one!
I feel really sorry for anyone who still has proper cravings, and relies on willpower. I repeat - read the Allen Carr book AS MANY TIMES AS IT TAKES FOR IT ALL TO MAKE SENSE!!!! and then stop.
It was easy, and that's saying something because I absolutely LOVED smoking and never ever thought I'd be able to stop!