if he had a family history of schizophrenia then how do you know it was the weed that made him schizophrenic, most people with schizophrenia start to experience the symptoms of schizophrenia about the same time that most people start smoking weed, so how do you know that it is the weed that did it, not just the natural course of schizophrenia, noone knows the truth to this question because you can make any study seem like weed is the cause when it really could just be the natural course of schizophrenia, that is my point here, noone really knows the right answer to this question, it is just like global warming, something that can be supposedly proven both ways that we really do not know the answer to