“…The results presented here support previously published findings that indicate peer substance use is a strong predictor of future use (Aziz & Shah, 1995;Cruz, Emery, & Turkheimer, 2012;Eitle, 2005;Hussong, 2002;Nakhaee & Jadidi, 2009;Pollard et al, 2010;Tang & Orwin, 2009;Vervaeke, et al 2008), as increased exposure to substance using peers leads to greater likelihood of initiation of use and greater use durations and frequency. No significant findings emerged when considering family history of substance use, likely due to sample homogeneity-all but three participants had drug-using family members.…”