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Illicit drug use frequencies by age of onset.
| Drug use and frequencies | Mean age of onset | Percent who use |
|---|---|---|
| Crack | 15.0 | 13.9 |
| Cocaine | 15.3 | 9.1 |
| Opiates | 16.2 | 10.8 |
| Stimulants | 15.0 | 5.4 |
| Ecstacy | 17.0 | 2.5 |
| Benzodiazapines | 15.4 | 7.5 |
| Hallucinogens | 15.0 | 32.2 |
| Over-the-counter drugs | 14.5 | 7.0 |
| Prescription drugs | 14.8 | 1.0 |
| Inhalants | 13.4 | 13.9 |
