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A new study into the effect of cannabis on Multiple Sclerosis has concluded that it doesn't slow down the progression of the disease as has been claimed in the past.
The drug is prescribed to sufferers to relieve pain and muscle spams.
The report's author Professor John Zijicek says trials like this are rare:
The first UK research study into the medical benefits of cannabis on Multiple Scelrosis has shown there is no benefit.
However there were benefits for those at the lower end of the disability scale.
The CUPID (Cannabinoid Use in Progressive Inflammatory brain Disease) study was carried out by researchers from the Peninsula College of Medicine and Dentistry.
It enrolled nearly 500 people with MS from 27 centres around the UK, who were either given capsules containing the active ingredient of cannabis and some given a placebo.
Alison Smith, an MS sufferer took part in the trial: