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People take ‘medicinal’ cannabis for pain relief, epilepsy, and as an anti-spasmodic for Multiple Sclerosis sufferers. But the side effects on memory and the risk of psychosis, especially in younger users, still remains an issue. Now researchers have separated the 'medical' from the 'narcotic' pathways in mouse brains, and from this, Dr Peter McCormick at the University of East Anglia in the UK thinks this could form the basis of a safe medical form of marijuana. (Photo caption: A cannabis plant © OLIVER BERG/AFP/Getty Images)