“…Professional substance user treatment is effective at promoting reductions in substance use and improvements in related functioning (Magura, Laudet, Kang, & Whitney, 1999;Mojtabai & Graff Zivin, 2003;Simpson, Joe, & Broome, 2002;Teesson et al, 2006); however, treatment lasts a relatively short period of time, even when clients complete the planned duration of services. Treatment gains tend to be shortlived and post-treatment rates of return to substance use are high, often occurring within a short time after services end (Gossop, Stewart, Browne, & Marsden, 2002;Laudet, Stanick, & Sands, 2007). It is therefore important to identify non-treatment factors that promote the maintenance of treatment gains into the post-treatment period; these factors may also be useful to persons who wish to stop using drugs and/or alcohol without seeking professional help -'selfchangers' (Toneatto, Sobell, Sobell, & Rubel, 1999;Sobell et al, 2001).…”