Intended for healthcare professionals

Letters High potency cannabis

Need for a comprehensive national survey of cannabis use

BMJ 2015; 350 doi: (Published 30 March 2015) Cite this as: BMJ 2015;350:h1668
  1. Ian Hamilton, lecturer in mental health1
  1. 1Health Sciences, University of York, York, UK
  1. ian.hamilton{at}

Hall and Degenhardt rightly draw our attention to the risks associated with cannabis use and to the evidence that has accumulated so far.1

It is crucial that we communicate these risks in a straightforward and honest way if policy makers and clinicians are to be viewed by young people as credible on …

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