I quit smoking on October 1st this year. I had smoked a pack or two a day for over 12 years straight. I was prescribed Welbutren to help me quit. At first, I thought I would just suddenly stop smoking, as I didn't want to. Thankfully, I realized that the medication does work, but only after I decided to put the cigarettes down. Didn't relapse a since time after that. Been smoke free for over 5 weeks.
Exercise in place of cravings, people that will help hold you accountable, & maybe join a stop smoking support group.
Good luck, you can do it!