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Violence associated with psychosis has also been well-documented. Marijuana use may be associated with increased impulsivity on the same day and the following day relative to days when marijuana was not used. It is also associated with increased hostile behaviors and perceptions of hostility in others on the same day compared to days when marijuana was not used. Cannabis use disorder appears to increase the risk of aggression towards others, particularly among youths. There is also evidence of a moderate association between cannabis use and physical violence.

Psychosis can be caused by various conditions, including licit and illicit substances, particularly cannabis. Cannabis has a higher conversion rate to psychosis than other substances. 32 percent of patients with substance-induced psychosis convert to either bipolar or schizophrenia-spectrum disorders, with the highest conversion rate found with cannabis-induced psychosis (47 percent). There is debate about the causal relationship between cannabis and psychosis. However, this can be demonstrated using Bradford-Hill criteria. Despite this, psychosis is often multifactorial in many instances. Cannabis exposure increases the risk of psychosis, from transient psychotic states to chronic recurrent psychosis. In individuals with established psychosis, cannabis has a negative impact on the course and expression of the illness.

The dark side of cannabis: increased risk of psychosis — https://www.kevinmd.com/2023/01/the-dark-side-of-cannabis-increased-risk-of-psychosis.html

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