Demographic characteristics of sample and details of uses of social drugs
| Characteristics | % |
| Age (y): | |
| <30 | 35.9 |
| 30–49 | 59.0 |
| >50 | 5.1 |
| Marital status: | |
| Married or cohabiting | 76.9 |
| Single | 23.1 |
| Formal education: | |
| ⩽10 y | 60.5 |
| 11–12 y | 15.8 |
| Technical college | 13.2 |
| University | 10.5 |
| Smoking history: | |
| Non-smokers | 41.0 |
| Ex-smokers | 25.6 |
| Current smokers | 33.3 |
| Smokes/day (mean (SD)) | 21.46 (7.59) |
| Caffeinated beverages: | |
| Consuming | 92.3 |
| Drinks/day (mean (SD)) | 4.29 (2.01) |
| Frequency of alcohol use: | |
| Rarely | 10.3 |
| Weekly | 41.0 |
| 2–3 Times weekly | 43.6 |
| Daily | 5.1 |
| Drinks/occasion: | |
| ⩽3 | 53.8 |
| ⩾4 | 46.2 |