You worked at a psychiatric institute. Of course a lot of the people coming through suffer from psychosis from drug use. Not a very fair group to base this opinion on. I have seen both sides.
It would take me much to convince me that marijuana is as harmful or more harmful than alcohol.
I base most of my thesis on folks I knew in and around school than the bug house. the hospital is the last place druggies or drinkers wind up...but when they do, they are doozies.