“…Among its distinct characteristics, emerging adults (EAs) have higher rates of current illicit drug use (21.5%) when compared to adolescents (10.1%) and adults aged 26 or older (6.6%) (Substance Abuse and Mental Health Services Administration, 2011). Mounting evidence also suggests that EAs have worse substance use treatment outcomes compared to both adolescents and older adults (Rossman, Roman, Zweig, Rempel, & Lindquist, 2011; Satre, Mertens, Arean, &Weisner, 2003; Satre, Mertens, Arean, & Weisner, 2004; Smith, Godley, Godley, & Dennis, 2011). It would be an advance if researchers could pinpoint aspects of development associated with substance use that may moderate the relationship between age and substance use treatment outcomes.…”