A quote from the abstract- " We show that topiramate combined with MET demonstrated efficacy for reducing how much cannabis adolescents smoked when they used but did not affect abstinence rates. The magnitude of this effect was modest, however, and topiramate was poorly tolerated by youths, which calls into question the clinical importance of these findings."

Please note that "the magnitude of the effect was modest", yet the article boasts "Combining the drug topiramate with psychological counseling curbed marijuana use among young smokers significantly more than did counseling alone".  Those two statements just don't jibe!