Adult Psychiatric, Substance, and Functional Outcomes of Different Definitions of Early Cannabis Use

Research on associations of early cannabis use with adult functioning reports mixed findings. This may be due, in part, to wide variations in the definitions of early cannabis use. This study aims to compare associations of 4 commonly used definitions of early cannabis use-related to timing, dose, duration, and associated symptoms-with adult outcomes.Analyses were based on a 20+-year longitudinal, community-representative study of 1,420...