“…In addition, to being a potential independent risk factor for suicide (Bertolote et al, 2003;Pompili et al, 2009), the co-occurrence of substance use disorders with other mental health difficulties has been associated with a substantially increased risk of suicide (Dumais et al, 2005;Sher, Grekin, & Williams, 2005). Both cannabis (Price, Hemmingsson, Lewis, Zammit, & Allebeck, 2009) and in particular heroin use (Pan et al, 2014) have been associated with increased rates of suicide, although the association between substance use and suicide is complicated by multiple demographic and clinical confounding factors. In this study, nine (20%) individuals had a history of a psychoactive substance use disorder.…”