Apart from issues dealing with safety and efficacy, there is also a fear that some of these patients being treated with medical marijuana might become dependent or addicted to it. This is as a result of reports coming from the National Institute on Drug Abuse, which warns that although marijuana seems to have some therapeutic properties, there is a possibility of dependency and subsequent addiction for minors. The risk of dependency in minors is as high as four to seven times more than that of adults which raises some concern for parents.