From: Perception of tobacco, cannabis, and alcohol use of others is associated with one’s own use
Model 1: tobacco use* | Cigarettes/week, IRR (95% CI) |
Perception of tobacco use of others (same age/sex), reference group = accurate estimation of tobacco use of others | |
Overestimation of tobacco use by others | 1.17 (1.05; 1.32) |
Underestimation of tobacco use by others | 0.99 (0.84; 1.17) |
Close friends with alcohol or drug problems | 2.08 (1.83; 2.35) |
Family history of alcohol problems (parents/siblings) | 1.48 (1.25; 1.75) |
Family history of drug problems (parents/siblings) | 1.52 (1.22; 1.89) |
Model 2: cannabis use* | Days of cannabis use/month, IRR (95% CI) |
Perception of cannabis use of others (same age/sex), reference group = accurate estimation of cannabis use of others | |
Overestimation of cannabis use by others | 1.43 (1.21; 1.70) |
Underestimation of cannabis use by others | 0.62 (0.23; 0.75) |
Close friends with alcohol or drug problems | 2.91 (2.48; 3.42) |
Family history of alcohol problems (parents/siblings) | 1.12 (0.89; 1.42) |
Family history of drug problems (parents/siblings) | 1.78 (1.36; 2.33) |
Model 3: drinking* | Drinks/week, IRR (95% CI) |
Perception of drinking of others (same age/sex), reference group = accurate estimation of drinking of others | |
Overestimation of drinking of others | 1.57 (1.43; 1.72) |
Underestimation of drinking of others | 0.41 (0.34; 0.50) |
Close friends with alcohol or drug problems | 1.43 (1.28; 1.59) |
Family history of alcohol problems (parents/siblings) | 1.35 (1.17; 1.55) |
Family history of drug problems (parents/siblings) | 1.38 (1.14; 1.67) |