Professor Donald Abrams, Professor of Clinical Medicine at the University of California San Francisco, discusses the usefulness of cannabis in treating a variety of medical conditions: "Cannabis has been a medicine for 3,000 years and only hasn't been for 77. So I think we can harken back to some of the prehistoric information that we have that suggests that cannabis was useful in a number of different conditions. And those conditions are still, I think, responsive to cannabis as a medicine." Abrams shares promising findings from various studies on cancer patients, patients with HIV and AIDS Wasting Syndrome, and more. He also discusses the differences between different consumption methods, the safety of mixing cannabis with opiates, the ways in which CBD and THC interact, the problems with observational research, and more.