I've never smoked but my father did and quit cold turkey one day in his 40s. I've really enjoyed reading everyone's suggestions. We've got a lot of smart and experienced people on this board.
The part about being 100% committed really rings a bell. I think it applies to taking on any difficult project. There must be no back door. Forward only! Right now, I'm committing myself to an exercise program. I'm tired of taking on middle age lard! There is no looking back! Onward!!!
Good luck, JazzyP, and keep us updated!