One in five people attending services with a substance use disorder (SUD) also has comorbid attention-deficit/hyperactivity disorder (ADHD). While some evidence shows that shared heritability might partly explain this frequent comorbidity, studies on this topic are scarce. Therefore, the goal of this study was to test whether ADHD and SUD have shared genetic influences. A total of 1,513 SUD treatment-seeking individuals of European ancestry were included in the study. Polygenic risk scores (PRS)…
