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Parents in the US with severely epileptic children are turning to marijuana for treatment.

Oil produced from a strain of the plant, which doesn't make the children high, appears to be having a dramatic effect on reducing seizures. It's being produced in Colorado, one of the two US states which has legalised cannabis.

Although not scientifically proven, families think it's making a big difference - and a British pharmaceutical company is trialling a new epilepsy drug based on cannabis extract, which has been approved by the US Federal Drug Administration.