Dr. Nora Volkow, the head of the National Institute on Drug Abuse, has revolutionized how science and medicine view addiction: as a disease, not a character defect. Morley Safer reports. This is a  thirteen minute  segment from 60 minutes from their late April 2012 episode. This is must-see for anyone who's a user and thinks they're not addicted....or perhaps are merely curious about what neuroscience tells us about addiction