Table 2.
Characteristics of study participants with a significant history of marijuana smoking
| Marijuana use; no. (%) of participants* |
||||
|---|---|---|---|---|
| Characteristic | No history of use n = 650 | Marijuana smokers†n = 124 | Current marijuana smokers‡n = 89 | p value |
| Age, yr, mean (SD) | 58.0 (12.4) | 51.0 (7.4) | 50.1 (7.5) | < 0.001** |
| Sex, male | 239 (36.8) | 66 (53.2) | 58 (65.2) | < 0.001** |
| White | 478 (76.7) | 111 (91.0) | 81 (94.2) | < 0.001** |
| Education level ≤ high school | 155 (24.0) | 32 (25.8) | 15 (16.9) | 0.27 |
| Annual income < $25 000 | 116 (22.3) | 13 (12.3) | 13 (16.5) | 0.045†† |
| Body mass index | 26.7 (5.4) | 26.5 (4.9) | 26.8 (4.6) | 0.91 |
| Postbronchodilator FEV1, % predicted | 98.3 (18.5) | 102.5 (14.2) | 104.2 (14.4) | 0.002** |
| Postbronchodilator FVC, % predicted | 100.5 (16.4) | 105.0 (14.4) | 105.9 (14.1) | < 0.001** |
| Current tobacco smoker§ | 55 (8.9) | 26 (21.0) | 30 (33.7) | < 0.001‡‡ |
| Lifetime tobacco dose, no. of pack-years,¶ median (IQR) | 15.3 (5.3–32.0) | 18.0 (6.3–32.0) | 18.5 (8.0–31.0) | 0.53 |
| Current asthma | 55 (8.5) | 4 (3.3) | 7 (7.9) | 0.13 |
| History of asthma | 98 (15.1) | 15 (12.1) | 10 (11.2) | 0.47 |
| Hospital admission because of breathing problems < 10 yr | 54 (8.3) | 11 (8.9) | 8 (9.0) | 0.96 |
| History of heart disease | 75 (11.5) | 11 (9.0) | 9 (10.1) | 0.66 |
| History of hypertension | 153 (23.5) | 14 (11.3) | 10 (11.2) | < 0.001** |
| History of diabetes | 46 (7.1) | 9 (7.2) | 4 (4.5) | 0.65 |
| History of tuberculosis | 19 (2.9) | 2 (1.6) | 5 (5.6) | 0.23 |
Note: FEV1 = forced expiratory volume in 1 second; FVC = forced vital capacity.
Unless indicated otherwise. One marijuana smoker could not be accurately classified because of a missing value in the question that pertains to current smoking status.
Participants who had smoked ≤ 50 marijuana cigarettes in lifetime.
Participants who had smoked marijuana within the past year.
Participants who had smoked tobacco within the past year.
Pack-years = the number of packs of cigarettes smoked per day multiplied by the number of years of smoking.
p < 0.05 for comparison between no history of marijuana smoking and former marijuana use; p < 0.05 for comparison between no history of marijuana smoking and current marijuana use.
p < 0.05 for comparison between no history of marijuana smoking and former marijuana use.
p < 0.05 for comparison between no history of marijuana smoking and former marijuana use; p < 0.05 for comparison between no history of marijuana smoking and current marijuana use; p < 0.05 for comparison between former marijuana use and current marijuana use.