Nothing is safe, >Acetaminophen overdose is actually the leading cause for calls to Poison Control Centers across the US—more than 100,000 instances per year—and, each year, is responsible for: More than 56,000 emergency room visits. 2,600 hospitalizations. An estimated 458 deaths due to acute liver failure.

Yes, there may be an extremely small correlation with marijuana use and a few mental disorders, but the studies themselves are rather lacking in materiality. I personally know three schizophrenics two from the same family and another friend, all had the disease manifest well before any drug use.

Your possible and et ceteras are quite weak, especially considering the other possible factors for those diseases and the lack of any hard findings. Funny how tylenol and twinkies lead to more detrimental health effects while showing very little benefit to society

It shows it's not safe, but it's harm is well within acceptable limits. Frankly, you'd have a hard time finding a natural product which was, on balance, as safe as cannabis when smoked.

It is possible that schizophrenics and similar disorders naturally gravitate to cannabis to lessen their symptoms.