| Genotype | Treatment | Active Smokers (n) | Former Smokers (n) | Never Smokers (n) |
| SZ | Treated | 0 | 7 | 3 |
| SZ | Untreated | 8 | 12 | 11 |
| ZZ | Treated | 0 | 19 | 10 |
| ZZ | Untreated | 2 | 2 | 0 |
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