smoking cessation
"I was given Zyban to stop smoking.  After three days I realized I had not smoked or wanted to in two days.  It was that fast.  I had no side effects that I remember and stopped taking them after two weeks.  It's been close to 10 years now and I have absolutely no craving or desire to smoke.  At the time I began Zyban I had smoked over a pack a day for about 14 yrs."