Not to take anything away from folks who've had success with Chantix, but it didn't agree with me. Made my hyper-depressed and nauseous all the time. I decided I'd rather be happy and smoking. An uneven tradeoff, I know.
This time I got a Xyban prescription and found it to be very effective. It's Wellbutrin (an MAOI, or anti-depressant) and in its generic form goes under the BuPropion handle. That stuff really works. Idea is to smoke for the first 10 days of treatment, then quit completely while still taking the drug. Worked great for me.
And yeah, there's times when I'm tempted (while having cocktails or playing a gig), but the thing to remember is this: you will have the craving whether you choose to smoke or not. The nicotine addiction demon is extraordinarily devious and will remain silent until you're at your most vulnerable. Once you realize this and can grapple with it mentally, you're on the path to successfully quitting. Regardless of what method you choose, good luck. The benefits are HUGE but not immediately obvious until you have some time behind you. Keep at it.