That would seem to be the implication of a new study just published online by the journal Drug and Alcohol Dependence. But the study's authors aren't so sure. The study measured drinking patterns in individuals who enrolled in treatment for marijuana dependence as part of a study designed to test different treatment methods. Participants greatly reduced their marijuana use, but 73 % also increased the number of days on which they drank alcohol by at least 10%. Most also increased the amount they…