Does marijuana use cause schizophrenia?

1/22/19–Currently, there is not enough evidence to support whether or not heavy use of marijuana causes schizophrenia or other syndromes. Even top scientists who specialize in marijuana research are divided, drawing opposite conclusions from the same data. The debate centers on the distinction between correlation and causation. People with psychotic problems often use marijuana regularly; this is a solid correlation, but it is unclear which came first, the marijuana habit or the psychoses. Read