I think it would be largely good to know, since being predisposed to schizophrenia doesn't necessarily mean you end up losing your sanity. Schizophrenia is largely genetic and physical markers of schizophrenia (e.g. abnormal thalamus shape) appear in the non-schizophrenic siblings of people suffering from schizophrenia... And if you're predisposed to schizophrenia, there are certain things you should avoid like cannabis consumption that can trigger schizophrenia in people who have the predisposition (and once schizophrenia is triggered, it isn't curable; only manageable with lifelong medication).
If a blood test could tell you that you have the equivalent of a deathly peanut allergy, but to weed (and instead of dying you get a permanent mental health issue that requires medication for the rest of your life), I think it would be better to know that than to not. Even if it's unfortunate and scary to know.
If a blood test could tell you that you have the equivalent of a deathly peanut allergy, but to weed (and instead of dying you get a permanent mental health issue that requires medication for the rest of your life), I think it would be better to know that than to not. Even if it's unfortunate and scary to know.