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29 October
7:35 pm

Scientific research is showing that recreational marijuana causes an increase in mental illness including schizophrenia and psychosis.

Overstated

Kelly Ayotte, at New Hampshire Governor General Election Debate (WMUR)

7:35 pm
Why this verdict View evidenceHide evidence
Why we checked itAyotte asserts a specific causal link between commercial marijuana use and increased rates of schizophrenia and psychosis, citing 'scientific research.' This is a contestable empirical claim about causation vs. correlation that could materially influence voters on marijuana legalization policy.
What we foundThe scientific evidence shows a strong and growing association between cannabis and psychosis/schizophrenia risk, but the claim that marijuana 'causes' these conditions overstates the current scientific consensus, which has not definitively established direct causation and identifies confounding variables as a key limitation.
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