TOPLINE: Adults with myocardial infarction (MI) and attention-deficit/hyperactivity disorder (ADHD) were more likely to smoke, use snus, and have histories of bleeding and chronic obstructive pulmonary disorder (COPD) than those without ADHD. Although ADHD was associated with a higher rate of all-cause mortality, these patients were less likely to participate in follow-up evaluations or quit smoking after discharge.