So where's the schizophrenia epidemic among pot-smoking hippies? It's had like 50 years to surface, man.
In all seriousness, there are a number of cohorts where this should be showing up with some regularity. Can you point me towards any of them?
All the hippies I know are still out there hippie-ing and living their lives, going to Dead shows, and so on. And, from my experience, they seem to be an unusually vigorous group for being so old.