Its a lot of mind over matter ( 30+ years of 20 a day ). Stopped nearly 5 years ago, woke up with a lung rattle and it scared the s**t out of me......never touched one since.
I had the craving for 3 years and the way i got thru it was to use wooden toothpicks (chewing them not lighting them) It keeps your hand/mouth busy in a way a little like a babies dummy/pacifier. Walking around with a stick in your mouth makes you look like a bit of a prat but it is so worth it, i spent about £4 on toothpicks over the 3 years and so far my lung rattle has not returned.