Peter Grinspoon, M.D. is a primary care physician and cannabis specialist at Massachusetts General Hospital and an Instructor in Medicine at Harvard Medical School. He is the author of the book ‘Seeing Through the Smoke: A Cannabis Expert Untangles the Truth about Marijuana’. He is a TedX speaker, a national media figure and the author of the groundbreaking memoir ‘Free Refills: A Doctor Confronts His Addiction’. He is a board member of the physician advocacy group, ‘Doctors for Cannabis Regulation’.