On average, participants reported smoking 2.86 cigarettes per day (median= 1.78, SD=3.35) and smoked for a mean of 1.37 years (median= 1.0, SD=1.36). Although on telephone screening we used inclusion criteria of smoking at least 1 cigarette per month but fewer than 5 CPD, for eligibility, 30 (18%) adolescents reported smoking 5–10 CPD and 7 (4%) reported smoking 10–20 CPD on the self-administered questionnaire. Forty-three (26%) participants reported smoking daily. Mean score on the mFTQ was 2.61 (median= 2.0, range= 0–7, SD=1.49). Duration of smoking (e.g., years since smoking first cigarette) was also correlated with CPD (r=.24, p=.01) and the mFTQ (r=36, p=<.001). Mean NMR value was 0.17 (SD=.094, median= .16, range= .03–.57; see Figure 1). There were no significant differences in the mean number of cigarettes smoked per day (p= .92) or scores on the mFTQ (p= .71) when comparing racial or ethnic groups.
