Just want to wish you luck!
Two things I know about helping fight cravings of anything you are addicted to:
Low dose (not what bipolar patients tke but teeny doses) lithium, a natural salt of the earth. Can be purchased as in lithium orotate online at www.iherb.com, a very reliable, safe, and quick supplement / vitamin house.
Cutting DRASTICALLY down on your sugars. For instance, no beverages that are sweet, stick to water. Save your special treats (healthiest: fruit, organic full at ice creams) for after a nice meal. Add more animal fats to your diet while cutting the sugars. Butter, eggs, good meats, and organic coconut oil (cook with it and put it in your smoothies, aim toward 3-4 tbsp daily). Do your best to avoid sugar you don’t appreciate, like breads, cereals, starches. That way your daily sugar grams can be spent on special treats for after meals when you were used to having a smoke. Have ice cream or a half bar of good chocolate instead.
If you drastically reduce your sugars (best would be no foods with grains in them at all, but you can get there as gradually as you like) and ADD HEALTHY FATS, which will satisfy you more deeply in the long run than sugars, YOU WILL NOT GAIN WEIGHT. Your meals will be more deeply satisfying and you might even find you go longer between meals.
Someone I know quit alcohol without AA cold turkey this way, by believing in the healthy paleo lifestyle and starting it first, then quitting alcohol. It’s been two years. Your brain is addicted, and brains are always starving for healthy animal fats.
Good luck!
Thanks for the tips and well wishes.