Interesting, because I'm having good success with Wellbutrin. My Doc started me on a lower dose (150mg daily) with instructions to do that for 2 weeks while trying to cut down on the amount I smoked. When I was ready for the big cold turkey (basically I smoked every bit of tobacco I could find in the house, car, etc. while resisting the impulse to buy any more) by running out of tobacco, I upped the dose to 300 mg and have been maintaining that level. I've been tobacco-free for close to 2 months now (I quit the day before Xmas eve) and am doing OK - though I will admit not feeling exactly the same as before beginning the Wellbutrin.
My plan is to take the 300mg for the full 60 days, then go back to 150 for a couple of weeks to wean myself from the Wellbutrin, after which I'll be 'drug free'.
Bottom line: my experience was not like yours! It's like just about any other substance; different folks will have different experiences. I will profess to being fairly resistant to big effects of drugs... in my wilder youth (shades of vintage GWB, eh?) I tried or used most of the recreational drugs out there, drawing the line at sticking anything into my veins or doing any of the BAD stuff like H, PCP and the like. I never freaked out on any of it, and none of that playing around had a lasting effect.
Good luck on quitting! I feel better already; breathing is easier, my cough is gone, food tastes better, etc. If I could do it after 40+ years of 1 or more packs per day, then so can you.
Congrats!! My grandfather quit after smoking more than a pack a day for 35 years. He's my hero, and I hope that one day I can kick it for good...it's just too darn expensive, if nothing else. :)