Habitual cannibis use is starting to be shown to impair brain development in ADHD teenagers(who sorely need brain development). The science is catching up with the anecdotal. The slacker “pothead” is really a thing it terms of changes to brain chemistry and reduction in cognitive and executive function. We now have a Big Weed like big pharma selling us junk science to make billions. I am not for banning any substance but please with the claims of reduction in anxiety, depression, etc. There are benefits to cannabis use for chemotherapy patients and people with certain neurological diseases but as a panacea for everything from ED to ADHD, the science does not back that up.
I am fairly convinced that the current epidemic of mentally ill people, including the ones who live on the streets, is the result of long-term and multi-generational drug use that's frying people's brains, especially when you consider today's pot is so much stronger.