Quit 3 days ago. Started when i was 13....
I must admit the best thing to use is 'the easy way to quit smoking' by Allen Carr. -
http://allencarr.com/central/
No side effects and you end up understanding why you smoke.
Clears up a lot of myths around nicotine replacment therapy, which i have tried in the past, the reason that method takes will power is it doesnt remove the craving in the first place.
And by the way the chemical addiction is gone after 48hrs after that your clear, yep 2 days down the line you have quit.
Good luck!