I quit smoking a few times, cold turkey each time. the last time i quit was 3.5 years ago. I still get cravings though they aren't as bad.
Part of what makes smoking hard to quit is the habbit is connected to other habbits. IE sitting down and having a smoke and coffee on lunch break, having a smoke on the way to work, smoking when you get to work, smoking after meals, smoking with beer.
I chewed alot of gum, put on alot of pounds, and bit my nails alot. In all it's worth it. I used to hack up something nasty every morning, and I'm sure it was preventing me from getting a good nights sleep.
I love not smelling, being able to breath and the cancer risks have gone down.