I quit cold turkey 14 years ago. I still have an occasional craving when I'm drinking, especially when I'm in a place where everyone else is smoking like a casino or bar. But I just tell myself I'm falling victim to the habit and I don't want one anymore.
The first week is the toughest. I quit because my fiance had cancer and he was quitting. It wasn't hard to quit while watching him go through chemotherapy because of his smoking. Don't make me post his surgery pictures!
Just know in your mind that you want to do it and you can. Set yourself up for success. Lots of carrots and celery to chew on (low calories, keeps your mouth and fingers busy). I lived on sunflower seeds for the first month or so. Drink lots of water and when you want a smoke, try to get outside and walk briskly somewhere. It gets lots of oxygen into your blood and cuts the craving, IMX.
Keep busy and stay focused on your goal. Have lots of things to do with your hands (take up knitting or sewing, do crossword puzzles) and things to put in your mouth that won't make you fat. I'm sure some of the boys will have a suggestion or two.
You can do it, but you have to stay focused and on track.