not really as these studies are often very narrow and centered. they rarely take into account dozens of other factors that may lead to any of the named conditions.
little johnny started to get high at 16 and turned all psycho....yes and little johnnys father used to kick the shhhh out of him daily after school. oh ya and to boot his mother was an alcoholic and habitual drug user.
david went loco in his office today and it was blamed on his heavy cannabis use. in other news davids mother died last week and he caught his wife cheating on with another man in their bed.
o ya and david's son is being relentlessly bullied and assaulted at school on a semi regular basis too.
could cannabis be a factor into some mental conditions. absolutely. however again so many factors go into that as well. was the person already wired to be that way and cannabis was one of the factors that put it over the edge. quite possible yes but then the issue was always there.
what about someone who drinks and smokes cannabis heavily ever day ?
blame cannabis.
and no that's not my parents and i am not johnny.