So because you smoked weed and got schizophrenia that means weed causes schizophrenia? I'm sure you are looking for something or someone to blame but this is not how science works. What reputable research study shows this to be true? What university conducted the research study? What was the sample size vs control group? For this to be proven true you would need to have huge population sizes and multiple research studies done by different universities concluding the same point. You offer no links to these research studies or any proof. Due to the U.S government scheduling Marijuana as a level 1 controlled substance little to no research can be conducted within the U.S at this time. FAULTY CAUSE AND EFFECT (post hoc, ergo propter hoc). This fallacy falsely assumes that one event causes another. Often a reader will mistake a time connection for a cause-effect connection. EXAMPLES: Every time I wash my car, it rains.