Discussion
We found that methamphetamine users who have been hospitalized have a much higher risk of receiving a subsequent diagnosis of schizophrenia than do matched population proxy groups. However, in comparison with the other drug use groups, the risk was similar to that of cannabis users and modestly higher than that of users of alcohol, cocaine, or opioids. Somewhat surprisingly, the risk of schizophrenia was also higher in users of all examined
drugs compared with the proxy comparison groups.