Development of an anxiety disorder following an emergency department visit due to cannabis use: a population-based cohort study

Abstract Background: There is ongoing uncertainty about whether cannabis use increases the risk of developing an anxiety disorder. In this study we estimated the risk of having an incident healthcare visit for an anxiety disorder following an emergency department (ED) visit for cannabis use and explored factors associated with increased risk. Methods: We used health administrative data to perform a population-based cohort study of all individuals aged 10–105 years with no previous healthcare visits for anxiety disorders in Ontario, Canada,