Table 1. Sample Demographics.

General characteristics
No. male (female)	17 (9)
Age (mean (SD))	25.92 (7.84)
Handedness	1 left handed
Years of education (mean (SD))	15.08 (2.04)
Estimated IQ (mean (SD))	115.77 (4.47)
Cannabis exposure
Age of first cannabis use	17.08 (2.60)
Days since last use/last exposure (mean (SD) range)	415.02 (819±0.36) (range 1–3650)
Total years of use (mean (SD) range)	6.85 (±4.54) 1–18
Frequency of cannabis use within past 30 days (n)	No. of subjects
0 days	12
1–3 days	3
4–8 days	3
9–15 days	5
16–29 days	2
Lifetime cannabis use (total no. of exposures)	No. of subjects
1–10	5
11–50	7
51–200	3
201–500	4
501–1000	3
>1000	4
Cannabis exposure during heaviest use (no. of exposures)	No. of Subjects
>1 to 1 × per year	2
1 × per every 3–6months	4
1–3 × per month	4
1–2 × per week	4
3–6 × per week	7
7 × per week	5
Other drug exposure
Daily cigarette smokers (# of subjects)	3
Average no. of alcoholic drinks per week (mean (SD))	6.01 (6.06)
Previous recreational exposure to illicit drugs other than cannabis	No. of subjects
None	11
Hallucinogens	12
Stimulants	10
Opiates	3
Inhalants	2

None of the subjects met criteria for abuse or dependence of the above illicit substances.