Dr. Thomas Marcotte l HIV, Cannabis, and the Brain: Impacts on cognition and public safety l Webinar March 12, 2021 cbdnews How Marijuana Works Comments Off on Dr. Thomas Marcotte l HIV, Cannabis, and the Brain: Impacts on cognition and public safety l Webinar Dr. Thomas Marcotte, Ph.D., Professor of Psychiatry and Co-Director of the Center for Medicinal Cannabis Research at the University of California, San Diego.