How to interpret studies on the impact of legalizing cannabis

Affiliations

• ¹ Centre of Interdisciplinary Addiction Research (ZIS), University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
• ² Department of Psychiatry, Medical Faculty, University of Leipzig, Leipzig, Germany.
• ³ Department of Finance, Operations and Information Systems, Brock University, St Catharines, Canada.
• ⁴ Institute of Public Health and Nursing Research, Department for Health and Society, University of Bremen, Bremen, Germany.
• ⁵ Bruyère Research Institute, Ottawa, Canada.
• ⁶ Department of Family Medicine, University of Ottawa, Ottawa, Canada.
• ⁷ Price School of Public Policy and Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, California, Los Angeles, USA.
• ⁸ Department of Social Sciences, Universidad Católica del Uruguay, Montevideo, Uruguay.
• ⁹ Institute for Mental Health Policy Research, Centre for Addiction and Mental Health, Toronto, Canada.
• ¹⁰ World Health Organization/Pan American Health Organization Collaborating Centre, Centre for Addiction and Mental Health, Toronto, Canada.
• ¹¹ Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, Canada.
• ¹² Centre of Interdisciplinary Addiction Research (ZIS), Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
• ¹³ Dalla Lana School of Public Health, University of Toronto, Toronto, Canada.
• ¹⁴ Institute of Medical Science, University of Toronto, Toronto, Canada.
• ¹⁵ Department of Psychiatry, University of Toronto, Toronto, Canada.
• ¹⁶ Program on Substance Abuse, Public Health Agency of Catalonia, Program on Substance Abuse and designated WHO CC, Public Health Agency of Catalonia, Barcelona, Spain.
• ¹⁷ Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty, University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany.
• ¹⁸ Addiction Suisse, Lausanne, Switzerland.