“…While these studies have yielded important insights into motivations, risk factors, and drug-specific experiences related to uptake of injection (Ahamad et al, 2014; Bryant and Treloar, 2007; Chami et al, 2013; Cheng et al, 2006; Day et al, 2005; Doherty et al, 2000; Eaves, 2004; Feng et al, 2013; Fuller et al, 2005, 2001, 2003, 2002; Goldsamt et al, 2010; Kermode et al, 2009, 2007; Lankenau et al, 2007, 2012, 2010; Lloyd-Smith et al, 2009; Mackesy-Amiti et al, 2013; Miller et al, 2011, 2006; Novelli et al, 2005; Ompad et al, 2005; Roy et al, 2010, 2011, 2003; Sherman et al, 2005; Small et al, 2009; Trenz et al, 2012; Valdez et al, 2007, 2011; Werb et al, 2013; Wood et al, 2008; Young and Havens, 2011; Young et al, 2014), they have not examined injection initiation extensively from the viewpoint of established PWID who often assist non-injectors into injection drug use. We know little about behaviors among established PWID that may socialize or promote uptake of injection drug use among non-injectors.…”