I went from 40 cigarettes a day to none...

it was easy... how i did it i reversed the craving in my mind.

when i really wanted one bad i would step back and say fuck look what this is doing to me so the more i craved the stonger i got and hated them

worked for me mate

lasted 4 years and i'm natrually thin but put on a shitload of weight and the strange thing was i was eating less and more active to help me and it was really hard to shift the weight... started smoking again and the weight fell off me and i'm back to my thin self again and feel great i will not stop smoking again

but if you are dedicated to stay in shape and can do that while giving up then that is the way to go mate... but for me i wasnt 100% commited to staying in shape so my cigs keep me in shape

good luck