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Subject characteristics (healthy intermittent smokers).
| Sex, male/female | 12/4 |
| Age, years | 49 (39–71) |
| Smoked pack years | 4 (0–40) |
| Smoked cigarettes per month | 14 (1–60) |
| FEV1, % predicted | 119 (68–144) |
| FEV1/ IVC, % | 77.6 (68.1–87.0) |
Values expressed as medians (ranges). FEV1: Forced Expiratory Volume in 1 second, IVC: Inspiratory Vital Capacity.
