I've been quit for over two years. It was probably one of the hardest things to do. Trust me when I say I have NO will power. Also, trying to do too much at one time is a recepit for failure. IMO, I would concentrate just on the smoking, and not so much on the diet. Knowlege is power when it comes to nicotene addiction. I think the more you know, understand, and prepare, the better chances you have to quit. I'm now a certified smoking cessation counsoler through the American Lung Association. Your best bet for success is a combination of medicine (zyban, chantix...) a NRT (gum, patch, lozenge) knowlege and a good quit plan. We are having wonderful success rates in the ranges of 80%!!!!! of keeping smokers off at the 1 year mark. Trust me, I'm one of them. I never thought in a million years you would get me to kick the habit, but now I could never imagine being a smoker again. Remember, you were born a non smoker, and you too could have a relapse. Good luck and here's a great link to help you.
Lot of great people there for support.
Quit Smoking | Smoking Cessation | Quit Smoking Support | Nicotine Addiction