Due to recently reported side effects with Chantix, approval for its use while flying has been withdrawn per a recent (May 22, 2008) communication from FAA, OKC. If you are taking it and wish to continue flying, you are to stop the medication and wait 72 hours before resuming crew duty. If you continue to use it, exercising the privileges of your medical would be a violation of 14 CFR 61.53. Sorry 'bout that !
Zyban and Wellbutrin have been used for smoking cessation however they are NOT approvable due to the type of drug (anti-depressant). Need more info, call or eMail.