Wellbutrin aka Zyban is not a cureall, and you can smoke beyond the quit date (said from experience). The smokes start tasting icky, and feeling funny. But if you are a die hard smoker you get past that, and get used to that icky taste. By then though, the Wellbutrin aint gonna do anything for your quiting. The whole you gotta want to quit thing is so true. Many who try and fail, deep down didnt really want to quit. Though as Munk says, smoking is as addictive as heroin, via the physical and mental withdrawals. I know I didnt quit for years, just because everytime I would try Id feel like I was dying. Worst withdrawals ever experienced, of course not that I am admitting to any other kinds of withdrawals. Anyways, some say smoking is related to depression. I know the studies are skewed, but I know I used to be in a real dark place, on a whole bunch of different meds, but after quiting smoking and getting physically active again Im in a better place than I have been in years without meds. There are still those dark days, but it seems a good bike ride can always make em a little less dim, when a whole bunch of other meds just made Mr. Happy (trying to keep it G rated) go limp.