I used to smoke a pack a day but stopped in september. Go to Holland and Barrett and get some herbal ciggies £.1.75 ish, vile but you dont want to smoke after them. Also there is usually a stand in some town centres where they have a black looking drink that is free and apparantly makes you stop - probably a pure mixture of tar and nicotine !
I have kinda started again on a few a day but aim to stop next week, believe me I can feel the difference in my health already !
Good luck !