Table 1. Characteristics of Research Participants.

Group	Nonsmokers (n=25)	Smokers (n=25)
Sex (M/F)	14/11	15/10
Age (years)	19 (1.32) (range: 16–21)	19.32 (1.57) (range: 15–21)
Ethnicity
White Caucasian	12% (n=3)	20% (n=5)
African American	16% (n=4)	4% (n=1)
Hispanic	4% (n=1)	20% (n=5)
Asian	36% (n=9)	32% (n=8)
Native American	4% (n=1)	4% (n=1)
Other	28% (n=7)	20% (n=5)
Education (years)	13.44 (1.35)	13.54 (1.35)
Age of onset (years) weekly smoking	N/A	17 (1.8) (range: 13–20)
Smoking duration (months)	N/A	2.6 (1.64) (range: 5 months–8 years.)
Cigarettes/day	N/A	6.72 (2.82) (range: 3–15)
Smoking exposure (months)	N/A	1.06 (1.24) (range: 1.4 months–6 years)
Cigarette Dependence Scale	N/A	36 (6.99) (range: 21–48)
Time to first cigarette of the day (minutes after waking)	N/A	65.91 (58.52) (range: 6–180)
Heaviness of Smoking Index	N/A	1.21 (1.04) (range: 0–3)
Marijuana (joints/week)	0.12 (0.33)	1.12 (1.78)
Alcohol (drinks/week)	1.58 (3.02)	5.27 (5.72)*

Abbreviations: F, female; M, male.

Data are presented as mean values (SD in parentheses).

There were no significant differences between groups except on alcohol consumption (number of drinks consumed per week) *p<0.001 by Student's t-test.