The problem is weed 1960s-80s was not like weed today, THC doses are much higher. 15-20X. Schizophrenia in Canada is way up, double 20 years ago, and our ERs now see Cannabinoid Hyperemesis Syndrome (CHS), psychosis, paranoia, panic attacks and a bunch of cardiac issues.
Our fucking idiot broski PM at the time legalized cannabis, but did not regulate the dosage.