I quit smoking almost 20 years ago, and the way I did it was by switching from Marlboro reds to an additive-free brand, like American Spirit. I smoked those for a few weeks and then quit cold turkey. The intense cravings only lasted about a day and a half. I fired up a Marlboro after a few days on the additive-free cigarettes and caught a buzz off it; they *really* ramp up the drug delivery in those things.