I'll bite. Most people who smoke pot start when they're young...either in their teens or early 20's. At that age human brains are still in a state of development. Pot use beginning in adolescence has been shown in several clinical studies increases the likelihood of schizophrenia. Pot impedes the development of the brain due to the tendency for it to remain in the brain for an extended amount of time after ingestion.
So yes, people who smoke pot are MORE likely to be crazy and do crazy things then those who do not.
And if all those people smoke pot in SF as the poster alluded to, and it makes them crazy, why is the murder rates and other crime rates so low compared to other cities in the Midwest, South and other regions?
Thanks!