Table 1. Subject Demographics.

Group	Non-smokers	Smokers
No. of subjects	7	7
Sex (M/F)	4/3	4/3
Age (years)
Mean ± SD	30.9±6.96	46.7±7.91
Range	25–42	40–61
FEV1 (L)
Mean ± SD	4.6±0.59	3.4±0.96
Range	3.80–5.43	2.35–4.69
FEV1/FVC (%)
Mean ± SD	81.7±2.61	68.5±9.2
Range	78.8–86.3	58.1–80.2
Subjects with airway obstruction	0/7	4/7
Packyears
Median	0	33
Range	0.0–0.9	23.4–54.4