Original paper: "Development Over Time of the Population-Attributable Risk Fraction for Cannabis Use Disorder in Schizophrenia in Denmark" (https://jamanetwork.

Original paper: "Development Over Time of the Population-Attributable Risk Fraction for Cannabis Use Disorder in Schizophrenia in Denmark" (https://jamanetwork.com/journals/jamapsychiatry/article-abstract/2782160 https://jamanetwork.com/journals/jamapsychiatry/article-abst...) "Question Has the population-attributable risk fraction for cannabis use disorder in schizophrenia increased over time, as would be expected with increasing use and potency of cannabis? "Findings In this Danish nationwide, register-based cohort study, the population-attributable risk fraction for cannabis use disorder in schizophrenia increased from approximately 2% in the period to 1995 to approximately 6% to 8% since 2010. "Meaning These findings may indicate that cannabis use disorders are associated with an increase in the proportion of cases of schizophrenia. "* The results from these longitudinal analyses show the proportion of cases of schizophrenia associated with cannabis use disorder has increased 3- to 4-fold during the past 2 decades, which is expected given previously described increases in the use and potency of cannabis. This finding has important ramifications regarding legalization and control of use of cannabis.*"