“…Several meta-analyses and numerous prospective studies have now shown that 12-step attendance alone, in combination with, and after treatment, is predictive of reductions in drinking (Emrick, Tonigan, Montgomery, & Little, 1993; Kaskutas, Bond, & Humphreys, 2002; Kelly, Stout, Magill, Tonigan, & Pagano, 2011; Tonigan & Rice, 2010; Tonigan, Toscova, & Miller, 1996) and illicit drug use (Gossop, Stewart, & Marsden, 2007; Timko, Billow, & DeBenedetti, 2006; Timko & Sempel, 2004; Weiss et al, 2005; Witbrodt & Kaskutas, 2005; Worley et al, 2008). It is important to note that long-term investigations into the benefits of 12-step programs are relatively rare, and a majority of studies are limited to 12-month follow-up.…”