As someone else said, let’s not confuse causation with correlation. Psychotics will often self-medicate with everything in sight, except perhaps their prescribed medication.
Going on 50 years of casual usage... not too crazy yet, and too old to cause much damage anyway.
I think the studies have shown causation and brain damage.
Psychotics don’t want to admit that they did it to themselves.
You haven’t booked any hotel room overlooking concerts for the next couple of months have you?