College-aged students are the largest demographic to misuse attention deficit hyperactivity disorder medication, according to a recent study. The study, done by the Johns Hopkins Bloomberg School of Public Health’s Department of Mental Health and published in 2016, shows that those between the ages of 18 and 25 account for 60 percent of ADHD medication misuse for those 12 and up, and that misusing the drug has been leading to more emergency room visits.