Psychiatric expert claims one in six people with psychosis is linked to cannabis use

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Victoria Allen And Kate Pickles For The Daily Mail A psychiatric expert has claimed one in six people with psychosis in Britain would never have developed it if they had not smoked cannabis. Professor Robin Murray, an authority on schizophrenia at King’s College London, said about 50,000 people were now diagnosed as psychotic solely because they used the drug while teenagers. Many had no family history of psychosis and would have had no risk of developing the disease if they had not smoked high-strength cannabis, he claimed. Professor Robin Murray said one in six people with psychosis in Britain would never have developed it if they had not smoked cannabis. Stock picture The academic’s comments follow a renewed debate over the legalisation of the drug, following the first ever NHS prescription for cannabis oil being given to 12-year-old Billy Caldwell to treat his epilepsy last week. The Royal College of Psychiatrists has also spoken out to warn that cannabis use doubles the risk of someone becoming psychotic, after former Tory leader William Hague suggested it should be decriminalised for recreational use.   Professor Murray said: ‘If you smoke heavy, high-potency cannabis, your risk of psychosis increases about five times. Psychiatric expert claims one in six people with psychosis is linked to cannabis use

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