Chantix is very nasty - I know a few people who took it and had severe depression, they described their mood as a total change and they couldnt quite describe it, but they got off it right away.
I myself am slated to try to quit again this week. And you're right, the hardest parts for me are getting into a car, having a drink, right after dinner or a meal, when a smoke is something I actually look forward to halfway into the meal (because a smoke after a meal is one of the best cigarettes of the day).
I find affiliate marketing makes smoking a serious challenge to quit. I constantly light up throughout the day as fires spring up, etc. I've quit 2-3 times before but my wife is a smoker, and we often quit at the same time, but one of us caves in eventually, and once one does, forget it, it's all over.
This time, I've decided enough is enough, gonna give it a serious effort and stick to it. I'm gonna be a grumpy ass sonofabitch, so apologies in advance if I call anybody a fucktard who didnt deserve it.