Oxford University has launched a £10m research programme looking into medicinal marijuana.
It's believed weed can have a positive effect on people suffering from conditions like Parkinson's disease and chronic pain.
But it's also been linked to mental health problems and, as a class B drug, being caught with it in the UK could land you with a five-year prison sentence.
The university will now look at whether it's possible to create new treatments by isolating the positive effects.
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