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Even if it does only cause psychosis in people who have a disposition to psychotic illness, why is that fine?

In that case seems like it would be fine... for people that don't have a predisposition for psychotic illness, right?

From the article:

> The report notes 94% of heavy cannabis users never experience psychosis.

Is there a number (below 100%) that would make it "fine"?

Because many things can trigger psychosis such as stress