Cannabis is seen among general population as an “anti-depressive drug”. Many papers have been published in the field of investigation about the relationship between cannabis use and affective disorders. We pretend to find the aspect of the psychological consequences of cannabis use.MethodsUsing Pubmed and PsychInfo, we conducted a narrative review of the literature on cannabis and psychiatric comorbidity using the keywords cannabis, psychosis, mood, depression, mania, bipolar, and anxiety.ResultsThere is substantial evidence of an association between cannabis use and psychosis. A few reports suggest an association with bipolar disorder while the association with depression and anxiety disorders is mixed.ConclusionsThe present review confirms earlier findings of an association between cannabis use and a lower age at onset. Data shows that cannabis use, beginning in the adolescence and with a frequency higher than once a week, correlates with the development in adult age of affective symptoms and/or disorder, mainly in bipolar disorder, with a moderate relation with Depressive spectrum. Even more, some authors hypothesize that cannabis may play a role in the development of the disorder, that to say, affective disorder would not appear in the absence of cannabis use. The current findings suggest that recent cannabis use is associated with a more severe course of illness in the early phase of BD I.Recent cannabis use was also associated with more lifetime suicide attempts.Disclosure of interestThe authors have not supplied their declaration of competing interest.
Excessive cannabis use is associated with earlier age at onset in bipolar disorder
