A chemical found in cannabis can act like an antidepressant, researchers have found. A team from Canada's University of Sasketchewan suggest the compound causes nerve cells to regenerate. The Journal of Clinical Investigation study showed rats given a cannabinoid were less anxious and less depressed. But UK experts warned other conflicting research had linked cannabis, and other cannabinoids, to an increased risk of depression and anxiety. They suggested this could be because different cannabinoids acting at different levels have contradictory effects. Cannabinoids have been shown to relieve the symptoms of multiple sclerosis and pain relief in humans. They are naturally...