I wish you well Sarah, not an easy task at all, the cravings are the worst of giving up, if you can stick to your guns, get busy when they kick in, you have a great chance of doing it.
It is true though, once a smoker always a smoker, at least in mind not body.
A friend of mine gave up smoking about 4 years ago, but still has the cravings every day and chews on gum when close to smokers.
The best thing about giving up, you can smell much better, infact you can smell fag smoke on smokers and become a smoke hater lol
Good Luck