Many physicians refrain from approving Cannabis use by patients because they learned nothing about Cannabis in medical school and cannot knowledgeably advise patients about dosage, side effects, mechanism of action, etc. This talk by UCSF oncologist/AIDS specialist Donald Abrams, M.D. to residents at Harbor-UCLA Medical Center is an exceptionally clear overview of the medical Cannabis field. Rolando Tringale, MD, invited Dr. Abrams on behalf of the Family Medicine Residency Program. O'Shaughnessy's arranged for videographer Chad Rea to tape the event.