The Link Between Marijuana and Schizophrenia(excerpt>
But here's the conundrum: while marijuana went from being a secret shared by a small community of hepcats and beatniks in the 1940s and '50s to a rite of passage for some 70% of youth by the turn of the century, rates of schizophrenia in the U.S. have remained flat, or possibly declined. For as long as it has been tracked, schizophrenia has been found to affect about 1% of the population.
That does not include the number of incarcerated individuals or those in mental institutions.
Also of note is that the US has one of the lowest rates of schizophrenia in the world =>
https://en.m.wikipedia.org/wiki/Epidemiology_of_schizophrenia
There is none so blind as those who refuse to see. Try walking the streets of any major liberal city wading through the litter and homeless camps and repeat as a mantra the rate of schizophrenia is not rising, the rate of schizophrenia is not rising...