“…Of the 23 articles selected for review, 19 (83%) directly analysed the association between the two environmental risk factors for psychosis: childhood trauma and substance use. In 16 of them, a positive association was found between both factors: specifically, in nine studies, childhood trauma was related to the use of different substances (Conus et al, 2010;Cutajar et al, 2010;Haahr et al, 2018;Neria, Bromet, Sievers, Lavelle, & Fochtmann, 2002;Rosenberg, Lu, Mueser, Jankowski, & Cournos, 2007;Schalinski, Fischer, & Rockstroh, 2015;Scheller-Gilkey, Moynes, Cooper, Kant, & Miller, 2004;Tomassi et al, 2017;van Nierop et al, 2016); in five studies, childhood trauma was related to cannabis use (Ajnakina et al, 2018;Compton, Furman, & Kaslow, 2004;Harley et al, 2010;Ramsay, Flanagan, Gantt, Broussard, & Compton, 2011;Saddichha, Werker, Schuetz, & Krausz, 2015); one study based its analyses on the relationship between trauma and cocaine use (Banducci, Hoffman, Lejuez, & Koenen, 2014); and another investigated the relationship between trauma and methamphetamine use (Ding, Lin, Zhou, Yan, & He, 2014). The remaining three studies found no significant relationship.…”