I quit smoking last June (2010)... Kinda on Chantrix.
First question: Did you quit smoking yet?
Now... Depending on how you are doing with your diet, there are likely going to be some issues with quitting smoking while Primal.
Nicotine has the effect of increasing blood sugar. A good deal of the effect that you get from smoking is a rise in blood sugar.
So, when you quit, your blood sugar has a tendency to crash.
This is why the trigger to eat is so powerful when you quit smoking.
This can be difficult when you are on Primal, because you are not eating things that spike your blood sugar the way nicotine used to do.
So, you may find that as you go through the first 72 hours of withdrawl, you may want to fall of the primal wagon, and feed your jones' with some sugar.
OR... first transition to a state of ketosis before quitting. (Get through the carb flu and everything). This will stabalize your blood sugar and the nic fits won't be quite as bad.
After 72 hours of being COMPLETELY nicotine free, you can start to dial back any added sugars, and move back into your primal eating patterns again.
But, don't be afraid to go off your diet to deal with the cravings... Getting yourself off the cigs is more important than a few days of indulgent eating... Just don't go TOO long or you will be fighting another demon if your body gets too far off the diet.
As for Chantix, I was on it for about a week, then I kicked it the same time I kicked the cigs.
I just wanted to get ALL the suffering OVER with. I did not want to deal with the pain of quitting cigs... then the pain of tapering down of the Chantix.
Regardless.... Good luck to you... You can do it.
And, here's a great resource to help you with quitting:
WhyQuit - the Internet's leading cold turkey quit smoking resource
A bit hard core... but great information there.