I don’t know about “madness,” but it is pretty clear that long term use messes you up.
Of course it could always be that people with seriously messed up thought processes and maturity issues tend to be marijuana users. Maybe they’d be just as screwed up even if they didn’t smoke.
My only marijuana joke: What’s the difference between a drunk driver and a stoned driver?
A drunk driver will blow right past a stop sign. A stoned driver will wait for it to turn green.
;^)