“…Relevant research includes analyses of interviews with substance users in uncontrolled recreational settings (Beck & Rosenbaum, 1994; Comis & Noto, 2012; Pennay & Moore, 2010; Singer & Schensul, 2011), user experience reports found on online message boards (Bersani et al, 2014; Kjellgren & Soussan, 2011), or interviews of participants involved in non-Western treatment settings (Loizaga-Velder & Verres, 2014; Presser-Felder, 2013; Shanon, 2002). Various substances have been investigated using qualitative methods, including ayahuasca (Loizaga-Velder & Verres, 2014; Presser-Felder, 2013; Shanon, 2002), salvia divinorum (Addy, Garcia-Romeu, Metzger, & Wade, 2015); 25C-NBOMe (Bersani et al, 2014), 4-HO-MET (Kjellgren & Soussan, 2011), MDMA (Passie, 2012; Comis & Noto, 2012; Singer & Schensul, 2011; Beck & Rosenbaum, 1994), and polysubstance use (Pennay & Moore, 2010). Other qualitative research with psychedelic substances has focused on religious/spiritual/mystical experiences (Yaden et al, 2016) or self-transcendent experiences occasioned by hallucinogens (Garcia-Romeu, Himelstein, & Kaminker, 2015).…”