A team of researchers has found that among cigarette smokers combining the smoking cessation medications varenicline and bupropion compared with varenicline alone resulted in higher smoking abstinence rates. 'We were interested in seeing if combining different medications together can improve the ability of patients to quit over and above single drug therapy' lead author Jon Ebbert M.D. Mayo Clinic Nicotine Dependence Center said. 'What we found was an increase in quit rates and the increase in quit rates was particularly strong in heavier and more dependent smokers.' The study authors looked at the efficacy of combining the medications varenicline and