Table I.
Demographic Characteristics and Cannabis Smoking Histories for 14 Frequent (A-N) and 11 Occasional (O-Y) Smokers
| Participant | Race and ethnicity | Gender | Age at admission | BMIa | Age 1st usea | Lifetime years smokeda | Time between last use and admission in h or d | Number of days used in last 14b | Average joint or joint equivalents /day or /monthb |
|---|---|---|---|---|---|---|---|---|---|
| A | B | M | 29.6 | 27.6 | 12 | 17.6 | 7.4 h | 11 | 4/d |
| B | B | M | 19.4 | 22.6 | 15 | 4.4 | 4.3 h | 13 | 5/d |
| C | B | M | 22.6 | 31.4 | 14 | 8.6 | 5.1 h | 12 | 3/d |
| D | W | M | 25.5 | 23.0 | 13 | 12.5 | 3.9 h | 14 | 20/d |
| E | B | F | 19.9 | 32.4 | 11 | 8.9 | 2.6 h | 14 | 3.5/d |
| F | B | M | 24.2 | 27.4 | 13 | 11.2 | 23.2 h | 12 | 1.5/d |
| G | W | F | 22.9 | 24.8 | 16 | 6.9 | 17.2 h | 14 | 6/d |
| H | B | M | 37.3 | 23.0 | 25 | 12.3 | 1.6 h | 14 | 3/d |
| I | B | F | 27.6 | 35.4 | 18 | 9.6 | 2.4 h | 14 | 4/d |
| J | B | F | 26.9 | 20.4 | 14 | 12.9 | 3.8 h | 14 | 21/d |
| K | B | M | 23.4 | 24.3 | 19 | 4.4 | 1.2 h | 14 | 6/d |
| L | B | M | 28.7 | 28.1 | 14 | 14.7 | 9.5 h | 14 | 6/d |
| M | B | M | 28.0 | 19.4 | 14 | 14.0 | 67.4 hc | 2c | 2/mc |
| N | B | M | 23.8 | 30.7 | 14 | 9.8 | 273 hc | 1c | 4/mc |
| Frequent | Mean | 25.7 | 26.4 | 15.1 | 10.6 | – | 13.3 | – | |
| StdDev | 4.6 | 4.8 | 3.5 | 3.8 | – | 1.1 | – | ||
| Median | 24.8 | 26.1 | 14.0 | 10.5 | 4.1 h | 14.0 | 4.5/d | ||
| O | W | M | 25.6 | 29.4 | 16 | 9.6 | 16 d | 0 | 2/m |
| P | W | M | 25.4 | 23.7 | 13 | 12.4 | 31 d | 0 | 2/m |
| Q | W | M | 23.7 | 24.1 | 16 | 7.7 | 10 d | 2 | 7/m |
| R | B | M | 38.2 | 21.0 | 19 | 19.2 | 2 d | 2 | 2/m |
| S | M | M | 41.3 | 22.0 | 16 | 25.3 | 7 d | 5 | 10/md |
| T | U | F | 34.9 | 31.7 | 13 | 21.9 | 9 d | 1 | 2/m |
| U | B | F | 36.5 | 47.8 | 18 | 18.5 | 2 d | 2 | 4/m |
| V | M & H | M | 22.5 | 25.2 | 13 | 9.5 | 86 d | 0 | 6/m |
| W | W | F | 34.2 | 26.6 | 14 | 20.2 | 3 d | 1 | 0.25/m |
| X | B & U | M | 31.7 | 21.8 | 16 | 15.7 | 18 d | 0 | 8/m |
| Y | B | M | 31.9 | 22.6 | 15 | 16.9 | 68 d | 0 | 2/m |
| Occasional | Mean | 31.4 | 26.9 | 15.4 | 16.1 | – | 1.2 | – | |
| StdDev | 6.3 | 7.7 | 2.0 | 5.7 | – | 1.5 | – | ||
| Median | 31.9* | 24.1 | 16.0 | 16.9* | 10 d* | 1.0* | 2/m* |
F, Frequent smoker; O, Occasional smoker; W, White; B, Black or African American; M, Mixed; U, Unknown; H, Hispanic or Latino.
aData collected at admission.
bData collected prior to study smoking.
cSelf-reported data not consistent with biological sample concentrations. Data excluded from mean and median.
dSelf-reported average use at screening of 0.5 joints, 3–4 times per month.
*Significant difference between groups (P < 0.05).