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The lifetime cannabis-use rates for patients with schizophrenia, major depressive disorder or bipolar disorder are 80%, 17% and 24%, respectively, the review found.
In one 2013 review, the authors concluded long-term cannabis use "increases the risk of psychosis in people with certain genetic or environmental vulnerabilities", but does not cause psychosis. Important predisposing factors were genetic liability, childhood trauma and urban upbringing. [ 26 ]
The magnitude of the connection between cannabis and schizophrenia for young men surprised study author Volkow, who was expecting the number to be closer to 10%. “This is worrisome,” she said.
It may be easy to assume that cannabis use causes psychosis. But evidence suggests there are several other plausible connections, write David Nathan and Peter Grinspoon
[121] [123] Some studies [clarification needed] suggest that cannabis is neither a sufficient nor necessary factor in developing schizophrenia, but that cannabis may significantly increase the risk of developing schizophrenia. Nevertheless, some previous research has been criticised as it has often been unclear whether cannabis use is a cause ...
However, this connection between cannabis and psychosis does not prove that cannabis causes psychotic disorders. [28] The causality theory for cannabis has been challenged as despite explosive increases in cannabis consumption over the past 40 years in western society, the rate of schizophrenia (and psychosis in general) has remained relatively ...
According to a new NAS report released on Thursday, Marijuana use may raise the risk of developing schizophrenia and other psychoses. Marijuana use linked to schizophrenia, no cancer threat Skip ...
[30] [63] Caffeine may worsen symptoms in those with schizophrenia and cause psychosis at very high doses in people without the condition. [64] [65] Cannabis and other illicit recreational drugs are often associated with psychosis in adolescents and cannabis use before 15 years old may increase the risk of psychosis in adulthood. [28]