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Onset sequencing of tobacco and marijuana by race (N = 716).
| Onset sequence | Blacks (n = 611) | Whites (n = 105) | Total (N = 716) |
|---|---|---|---|
| Marijuana initiated before tobacco | 13.4% | 6.7% | 12.4% |
| Tobacco initiated before marijuana | 42.2% | 57.1% | 44.4% |
| Marijuana and tobacco initiated at the same age | 12.9% | 11.4% | 12.7% |
| No use of either tobacco or marijuana | 31.4% | 24.8% | 30.4% |
