Mel for starters the biggest thing he needs is unbiased and nfaltering support. Remind him how couragous this step is and that you understand what might happen.
Personal contracts are often used, as are taking up alternate hobbies (skydiving is tops!) and removing youself from situations where you might have smoked before.
Give your local hospital a call. The one I used to work at had a support service that was offered free, and had a range of programs and therapies availalbe. Something should also be avaiable at you local community health centre.
Wish him all the best and most positive thoughts for us.