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And I think that is the myth.

I can tell you from personal experience that's not a myth. (Not me, personally, my immediate family member).

One LSD trip triggered permanent psychosis.

Umm...are you sure? Are you sure the LSD triggered "permanent psychosis"?

Yes, this is what I personally witnessed happen to an immediate family member, minus the scare quotes.

The LSD trip definitely caused psychosis and the psychosis has been permanent thus far (this was over a decade ago!). I literally saw it happen.

So when you say permanent psychosis, what are the symptoms?