My father smoked for over 4 decades. Multiple packs (usually 3+) of Reds every day. Had a couple of minor heart attacks and quit cold turkey. I don't remember a single moment I spent with him growing up when there wasn't a cigarette burning. If that man could walk away from them cold turkey, any one can.
I quit cold turkey, too. The biggest thing was changing the lifestyle. Stay out of bars for awhile. When you get out of bed, go for a walk, do some push ups, or some other kind of physical activity. Just don't do the things that you associate (mentally or physically) with smoking.
It's really not as hard as you think. Getting through the first few days, while the physical part is kicking you so regularly, is the toughest part.