"Smokers who use the prescription-only anti-smoking agent varenicline triple their likelihood of successfully kicking the habit, compared with trying to quit without medication, a new review concludes. The drug, Chantix, partially stimulates nicotine receptors in the brain, which helps reduce nicotine withdrawal symptoms. It also partially blocks nicotine from attaching to these receptors, making smoking less satisfying and so curbing a person's desire to smoke." Go here for the whole Reuters article.