Roberto Olivardia is a Clinical Psychologist and Clinical Instructor of Psychology at Harvard Medical School. He maintains a private psychotherapy practice in Lexington, Massachusetts, where he specializes in the treatment of attention deficit hyperactivity disorder (ADHD), executive functioning issues, and issues that face students with learning differences. Roberto joins me to discuss the harmful effects of cannabis on ADHD which is a discussion that is now being looked into since the mass popularity of legalization.