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Well, speaking as someone who's quit smoking and several other habit-forming things as well, the one thing I can say is you have to actually quit to quit. As long as he's still smoking even one cigarette a day (or any amount), he's still smoking. He needs to just shut the door on it, because otherwise it still has that hook in him and the potential is there for him to smoke a little more, then a little more, and next thing you know it's back up to a pack a day. I went for years like that, literally, hating smoking but not being able to just really quit. I eventually was able to do it by using nicotine lozenges, although it helped that I was sufficiently motivated and ready.
Perhaps it would help him to develop some new routines for the times when he usually wants to smoke. He could substitute something like a special snack after meals instead of a cigarette, or even some little ritual like tying a piece of string around his finger or fiddling with a little rock in his hand until the urge passes. Anything, really.
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