Cannabis makes pain more bearable rather than actually reducing it, a study from the University of Oxford suggests.
Using brain imaging, researchers found that the psychoactive ingredient in cannabis reduced activity in a part of the brain linked to emotional aspects of pain.
But the effect on the pain experienced varied greatly, they said.
The researchers' findings are published in the journal Pain.
The Oxford researchers recruited 12 healthy men to take part in their small study.
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http://www.bbc.co.uk/news/health-20810603