If you read my blog regularly, you will know that I have little or no time for drugs to help smokers quit smoking. I believe smoking can be successfully overcome without drugs whatsoever, either by hypnosis or by using my own EasyQuit System book, available at http://easyquitsystem.com
I found the following BBC Panorama investigation on the BBC's website. You will need Windows Media Player to view this:
Secrets of the Drug Trials
Nicotine Replacement Therapy, Zyban and Varenicline have all got flawed efficacy studies in my opinion. Think carefully before turning to these solutions.
As ever, never stop trying to quit smoking.