TABLE 1. Demographic characteristics of study participants.

	Study 1	Study 2
Number of participants	10	11
Race (Black/White/Mixed/Pacific Islander)	6/1/3/0	9/1/0/1
Age (years)	29 ± 6	27 ± 5
Ethnicity (Hispanic/non-Hispanic)	3/7	3/8
Marijuana use (#days/wk)	6.7 ± 0.9	6.9 ± 0.2
Marijuana cigarettes/day	9.4 ± 3.9	11.9 ± 5.3
Years of marijuana use	11.5 ± 6.9	8.9 ± 4.8
Cigarettes Smokers (#)	8	7
Cigarettes/day	7.3 ± 1.7	11.8 ± 4.4
Alcohol Drinkers (#)	6	4
Alcohol: Drinks/week	14.8 ± 19.3	3.7 ± 2.3
Weight (kg)	75.4 (± 9.4)	75.2 (± 12.1)
Education (years)	13.0 ± 1.6	12.6 ± 1.1

Note: Data are presented as means (± standard deviation) or as frequency