I did a lot of research on Brain Injuries, and when I was recovering from one, I was with a lot of recovering stroke-victims. What happens is that a shock to the brain, such as a tremendous impact or blood-hemorraging, triggers the hippocampus to use the cannabinoid system with brain neurons to heal and protect the body. Once this happens, marijuana becomes a very spiritual thing to you, because of the hippocampi and anandamides, etc...