I think it's fishy just by their use of the word 'psychotic'. Isn't psychosis just an umbrella term for pretty much any disorder of the mind? I mean,
which psychosis?
According to Wikipedia:
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Some studies indicate that cannabis use may lower the threshold for psychosis, and thus help to trigger full-blown psychosis in some people.[70] Early studies have been criticized for failing to consider other drugs (such as LSD) that the participants may have used before or during the study, as well as other factors such as pre-existing ("comorbid") mental illness. However, more recent studies with better controls have still found a small increase in risk for psychosis in cannabis users[citation needed]. It is not clear whether this is a causal link, and it is possible that cannabis use only increases the chance of psychosis in people already predisposed to it; or that people with developing psychosis use cannabis to provide temporary relief of their mental discomfort. The fact that cannabis use has increased over the past few decades, whereas the rate of psychosis has not, suggests that a direct causal link is unlikely for all users.[71]
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