Marijuana has a reputation for helping people who are in pain. But achieving the analgesic effect comes at a cost: users of the drug complain of memory loss and mood disturbances. Now, by identifying the pathway in the brain that is responsible for these psychoactive side effects, University of East Anglia researcher Peter McCormick has found that in experimental mice it's possible to isolate just the pain killing actions Like this podcast? Please help us by supporting the Naked Scientists