The way I understand the marijuana - schizophrenia link is that it brings it out in people who are already at risk for it (or have it, but do not know they have it). Not that it causes it. There is a difference.
People who have, who are at risk for schizophrenia, or who have shown tendencies, are generally supposed to stay away from all drugs, even alcohol. That's because drugs cause people to disassociate from reality. Marijuana does this. Perhaps people who are used to it don't think about that too much because they have built something of a physical and mental tolerance to it, but marijuana can be quite dissociative.
If you already have a condition that causes you to separate from reality, obviously any drug is just going to make it worse. The problem with schizophrenia is that it often isn't diagnosed before a fairly serious incident.
I'll end by saying, I'm not a doctor, this is just the understanding that I have from reading on the subject. If anyone who knows more about schizophrenia wants to jump in to agree, disagree, or correct, I'm definitely here to listen.
As well, I'll add that this doesn't mean I'm against making it legal either. I think we should. Just that there are some things to consider when drafting up policy.
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