Neurological differences don't necessarily mean impairment

Cannabis-induced psychosis is fairly well studied. You almost certainly have met someone who becomes incredibly paranoid after smoking pot (extreme paranoia is after all, a psychotic event). There is a lot of literature on the link between schizophrenia and pot (both ways, schizophrenics are more likely to smoke pot and pot smokers are more likely to become schizophrenic). Now it might not be causal, but they are linked, so seeing stories like that isn’t abnormal. The fact is, we don’t know if people who have psychotic breaks after smoking pot would have had them later without it.

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