Could an app motivate marijuana users to exercise? The National Institutes of Health is giving $357,750 in taxpayer dollars through its National Institute on Drug Abuse to State University of New York at Buffalo to find out. “Currently, marijuana (MJ) is the most popular illicit drug, but there are few effective interventions to help young adults (age 18 to 25 years) to reduce their MJ intake and avoid negative consequences, including dependence,” the grant noted. “This study will develop and initially test an intervention [personalized feedback on MJ use + a smartphone app to promote exercise/physical activity (PA) as a...