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  • Cited by 3
  • Cited by
    Crossref Citations
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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.
    Colizzi, Marco and Bhattacharyya, Sagnik 2018. Cannabis use and the development of tolerance: a systematic review of human evidence. Neuroscience & Biobehavioral Reviews, Vol. 93, Issue. , p. 1.
    Colizzi, Marco Burnett, Natoy Costa, Rosalia De Agostini, Mattia Griffin, James and Bhattacharyya, Sagnik 2018. Longitudinal assessment of the effect of cannabis use on hospital readmission rates in early psychosis: a 6-year follow-up in an inpatient cohort. Psychiatry Research,
    Colizzi, Marco McGuire, Philip Giampietro, Vincent Williams, Steve Brammer, Mick and Bhattacharyya, Sagnik 2018. Modulation of acute effects of delta-9-tetrahydrocannabinol on psychotomimetic effects, cognition and brain function by previous cannabis exposure. European Neuropsychopharmacology, Vol. 28, Issue. 7, p. 850.
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Cannabis and psychosis: what do we know and what should we do?

  • Marco Colizzi (a1) and Robin Murray (a2)
Summary

It is now incontrovertible that heavy use of cannabis increases the risk of psychosis. There is a dose–response relationship and high potency preparations and synthetic cannabinoids carry the greatest risk. It would be wise to await the outcome of the different models of legalisation that are being introduced in North America, before deciding whether or not to follow suit.

Declaration of interest

None.

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Copyright
COPYRIGHT: © The Royal College of Psychiatrists 2018 
Corresponding author
Correspondence: Marco Colizzi, Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK. Email: marco.v.colizzi@kcl.ac.uk
References
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1National Academies of Sciences, Engineering, and Medicine. The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations for Research. The National Academies Press, 2017.
2Hasin, DS, Sarvet, AL, Cerdá, M, Keyes, KM, Stohl, M, Galea, S, et al. US adult illicit cannabis use, cannabis use disorder, and medical marijuana laws: 1991-1992 to 2012-2013. JAMA Psychiatry 2017; 74: 579–88.
3Hall, W, Lynskey, M. Evaluating the public health impacts of legalizing recreational cannabis use in the United States. Addiction 2016; 111: 1764–73.
4Murray, RM, Englund, A, Abi-Dargham, A, Lewis, DA, Di Forti, M, Davies, C, et al. Cannabis-associated psychosis: neural substrate and clinical impact. Neuropharmacology 2017; 124: 89–104.
5Marconi, A, Di Forti, M, Lewis, CM, Murray, RM, Vassos, E. Meta-analysis of the association between the level of cannabis use and risk of psychosis. Schizophr Bull 2016; 42: 1262–9.
6Colizzi, M, Iyegbe, C, Powell, J, Blasi, G, Bertolino, A, Murray, RM, et al. Interaction between DRD2 and AKT1 genetic variations on risk of psychosis in cannabis users: a case-control study. NPJ Schizophr 2015; 1: 15025.
7Englund, A, Freeman, TP, Murray, RM, McGuire, P. Can we make cannabis safer? Lancet Psychiatry 2017; 4: 643–8.
8Altintas, M, Inanc, L, Oruc, GA, Arpacioglu, S, Gulec, H. Clinical characteristics of synthetic cannabinoid-induced psychosis in relation to schizophrenia: a single-center cross-sectional analysis of concurrently hospitalized patients. Neuropsychiatr Dis Treat 2016; 12: 1893–900.
9Schoeler, T, Petros, N, Di Forti, M, Klamerus, E, Foglia, E, Ajnakina, O, et al. Effects of continuation, frequency, and type of cannabis use on relapse in the first 2 years after onset of psychosis: an observational study. Lancet Psychiatry 2016; 3: 947–53.
10Colizzi, M, Carra, E, Fraietta, S, Lally, J, Quattrone, D, Bonaccorso, S, et al. Substance use, medication adherence and outcome one year following a first episode of psychosis. Schizophr Res 2016; 170: 311–7.
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  • Cited by 3
  • Cited by
    Crossref Citations
    Crossref logo
    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.
    Colizzi, Marco and Bhattacharyya, Sagnik 2018. Cannabis use and the development of tolerance: a systematic review of human evidence. Neuroscience & Biobehavioral Reviews, Vol. 93, Issue. , p. 1.
    Colizzi, Marco Burnett, Natoy Costa, Rosalia De Agostini, Mattia Griffin, James and Bhattacharyya, Sagnik 2018. Longitudinal assessment of the effect of cannabis use on hospital readmission rates in early psychosis: a 6-year follow-up in an inpatient cohort. Psychiatry Research,
    Colizzi, Marco McGuire, Philip Giampietro, Vincent Williams, Steve Brammer, Mick and Bhattacharyya, Sagnik 2018. Modulation of acute effects of delta-9-tetrahydrocannabinol on psychotomimetic effects, cognition and brain function by previous cannabis exposure. European Neuropsychopharmacology, Vol. 28, Issue. 7, p. 850.
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Cannabis and psychosis: what do we know and what should we do?

  • Marco Colizzi (a1) and Robin Murray (a2)
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