That doesn't differentiate between "ones that medicate get psychoses" and "ones that get psychoses medicate" (or, "ones with X medicate and get psychoses", for that matter).
The people here aren't lab rats; you can't have a control group of people who are prevented from taking drugs even if they would have; and that's the control group that you would need to have in order to indicate causation as well as correllation.
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