“…These variables include age, gender, educational level, age of onset of daily smoking, friends' smoking behavior, selfefficacy, motivation, alcohol consumption, and marijuana use, as measured in the pre-treatment questionnaire (Breslau & Peterson, 1996;Ellickson, Tucker, & Klein, 2001;Engels, Knibbe, de Vries, & Drop, 1998;Lim et al, 2012;Otten, Bricker, Liu, Comstock, & Peterson, 2011;Paavola, Vartiainen, & Puska, 2001). Only gender was found to be associated with treatment group assignment (Table 1).…”