> It could very well be that marijuana puts you at higher risk of schizophrenia
More likely, marijuana use accelerates the development of schizophrenia among people already at risk.
> it could also be increases in the percentage of cases that actually get diagnosed, etc.
This is generally a valid stock response to these sorts of studies. But it strikes me as a bit unlikely that there was previously a large amount of undiagnosed schizophrenia.
(Unless we have broadened the definition recently).
More likely, marijuana use accelerates the development of schizophrenia among people already at risk.
> it could also be increases in the percentage of cases that actually get diagnosed, etc.
This is generally a valid stock response to these sorts of studies. But it strikes me as a bit unlikely that there was previously a large amount of undiagnosed schizophrenia.
(Unless we have broadened the definition recently).