This clip is from the recently-aired PBS documentary, 'Clearing the Smoke: The Science of Cannabis,' which explores the scientifically proven fact that cannabinoids kill cancer cells in test tubes and in laboratory animals.
Cannabinoid receptors exist throughout organs of the human body, especially in the brain and in the immune system. These act like targets for cannabinoids. Once they bind to the receptors, peptides are released that tell the cancer cells to die, i.e., to commit suicide.
One doctor interviewed has been so encouraged by the laboratory results that he has begun cannabis trials with his own leukemia patients.
