When taking Chantix to quit smoking you should begin taking the Chantix 14 days before your quit date that you set.
It can take a week or even two weeks to start seeing and feeling the full effects of the Chantix so you need to give it enough time to work and curb your cravings for smoking.
You usually need to continue taking Chantix for up to 12 weeks for your cravings for smoking to fully go away and you may still have to take Chantix for another 12 weeks before you're fully smoke free.
Chantix does work but you must follow through with it to fully quit smoking.