develop no problems. In 2009 Murray had a public disagreement with David Nutt in the pages of The Guardian about the dangers of cannabis in triggering psychosis. Murray previously wrote that while the risk increase is "about five-fold [...] for the heaviest users", the issue has become a political football. Murray has commented repeatedly on these issues in BBC articles and programmes, including in a Panorama documentary on BBC One. Knighthood Murray was knighted in the 2011 New Year Honours for his services to medicine. See also Substance abuse Effects of cannabis References 1944 births Living people Medical doctors from Glasgow Alumni of the University of Glasgow Academics of King's College London Fellows of King's College London Knights Bachelor Fellows of the Royal College of Psychiatrists Fellows of the Royal Society NIHR Senior Investigators Scottish knights Scottish psychiatrists 20th-century Scottish medical doctors 21st-century Scottish medical doctors Presidents of the European Psychiatric Association Members of the National Academy of Medicine