There are high rates of cognitive dysfunction, especially executive dysfunction, in college students who misuse prescription stimulants compared with those who do not, new research suggests. "It is estimated that attention-deficit/hyperactivity disorder [ADHD] affects up to 8% of college students in the US," lead author Timothy Wilens, MD, from Massachusetts General Hospital, Boston, said in a poster session here at the American Academy of Addiction Psychiatry (AAAP) 27th Annual Meeting.