Bupropion
"I used zyban years ago to quit and it did help but I started again after I went off it.  I have been trying to quit for the last year but haven't made it past a few days.  I am 36 and have smoked since I was about 20, 16 years of damage to my lungs.

I decided it's now or never I just want to be a non smoker so badly.  I went and got a prescription for zyban 4 days ago and started immediately. So far I feel ok on it, I definitely feel different, time feels slower and I feel like I'm observing things differently in somewhat removed.  Today is my first day taking two pills and I'm a little worried I will feel messed up on the medication but gonna stick with it.  I'm still smoking but plan on quiting within the next week."