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| Variables | Never | Once/Twice | Monthly | Weekly | Daily |
|---|---|---|---|---|---|
| Smoking | 32 | 18 | 8 | 11 | 19 |
| Alcohol | 8 | 19 | 4 | 6 | 3 |
| Cannabis | 10 | 6 | 0 | 3 | 0 |
| Cocaine | 6 | 3 | 0 | 3 | 0 |
| Amphetamine | 13 | 9 | 4 | 3 | 2 |
| Inhalants | 16 | 14 | 4 | 3 | 0 |
| Tranquilizers | 26 | 18 | 6 | 4 | 2 |
| Hallucinogen | 2 | 1 | 0 | 2 | 0 |
| Opiates | 13 | 3 | 0 | 3 | 0 |
| Other | 11 | 7 | 2 | 2 | 1 |
