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Cannabis-use disorder is characterised by a patient exhibiting a problematic pattern of cannabis use that leads to clinically significant impairment, or to distress.[APA, 2013] Cannabis use is often reported to be a form of self-medication, in order to cope with mood disorders, or other psychological problems.[APA, 2013]
References:
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. Fifth Edition (DSM-5™). © American Psychiatric Association, 2013.
Buckley PF, Miller BJ, Lehrer DS, Castle DJ. Psychiatric comorbidities and schizophrenia. Schizophr Bull 2009; 35 (2): 383–402.
Koskinen J, Lohonen J, Koponen H, et al. Rate of cannabis use disorders in clinical samples of patients with schizophrenia: a meta-analysis. Schizophr Bull 2010; 36 (6): 1115–1130.
Patel R, Wilson R, Jackson R, et al. Association of cannabis use with hospital admission and antipsychotic treatment failure in first episode psychosis: an observational study. BMJ Open 2016; 6 (3): e009888.