Research suggests that experiencing substance-induced psychosis increases the risk of developing a schizophrenia spectrum disorder (SSD), but less is known about substance use without psychosis. In a study including 10 million people, Canadian researchers found that individuals with an emergency department visit for substance-induced psychosis were 163 times more likely than the general population to develop a SSD within three years. However, visits for substance use without psychosis occurred more often and were associated with a higher absolute number of transitions to SSD. The findings emphasize the importance of early intervention for substance use concerns – with or without psychosis – to decrease risk of schizophrenia and related conditions. To learn more, see the study in JAMA.