The Science of Medical Cannabis: A Conversation with Donald Abrams, M.D. March 3, 2021 cbdnews Marijuana Medical Benefits Comments Off on The Science of Medical Cannabis: A Conversation with Donald Abrams, M.D. Donald Abrams, M.D. is chief of Hematology and Oncology at San Francisco General Hospital and the co-author—with Andrew Weil—of Integrative Oncology …