Table 4.

Demographics and self-reported cannabis smoking histories for 24 cannabis smokers.

Participant	Racea	Sex	Age, years	BMI, kg/m2	Days smoked in past 14	Mean use, joints	Age first smoked, years	Lifetime years smoked
Chronic smokers
A	AA	M	29.6	27.6	11	4/day	12	17.6
B	AA	M	19.4	22.6	13	5/day	15	4.4
D	W	M	25.5	23.0	14	20/day	13	12.5
E	AA	F	19.9	32.4	14	3.5/day	11	8.9
F	AA	M	24.2	27.4	12	1.5/day	13	11.2
G	W	F	22.9	24.8	14	6/day	16	6.9
H	AA	M	37.3	23.0	14	3/day	25	12.3
I	AA	F	27.6	35.4	14	4/day	18	9.6
J	AA	F	26.9	20.4	14	21/day	14	12.9
K	AA	M	23.4	24.3	14	6/day	19	4.4
L	AA	M	28.7	28.1	14	6/day	14	14.7
M	AA	M	28.0	19.4	2b	2/monthb	14	14.0
N	AA	M	23.8	30.7	1b	4/monthb	14	9.8
Median			25.5	24.8	14.0	4.5/day	14.0	11.2
Mean			25.9	26.1	13.5	6.9/day	15.2	10.7
SD			4.7	4.7	1.0	6.5/day	3.7	3.9
Occasional smokers
O	W	M	25.6	29.4	0	2/month	16	9.6
P	W	M	25.4	23.7	0	2/month	13	12.4
Q	W	M	23.7	24.1	2	7/month	16	7.7
R	AA	M	38.2	21.0	2	2/month	19	19.2
S	M	M	41.3	22.0	5	10/month	16	25.3
T	U	F	34.9	31.7	1	2/month	13	21.9
U	AA	F	36.5	47.8	2	4/month	18	18.5
V	M	M	22.5	25.2	0	6/month	13	9.5
W	W	F	34.2	26.6	1	0.25/month	14	20.2
X	AA	M	31.7	21.8	0	8/month	16	15.7
Y	AA	M	31.9	22.6	0	2/month	15	16.9
Median			31.9	24.1	1	2/month	16	16.9
Mean			31.4	26.9	1.2	4.1/month	15.4	16.1
SD			6.3	7.7	1.5	3.1/month	2.0	5.7

^aAA, African American; W, white; M, mixed; U, unknown.

^bSelf-reported data not consistent with biological sample concentrations. Data excluded from mean and median.