Table 1. Clinical characteristics of subjects.

Variables	Never smokers (n = 43)	Current smokers (n = 90)
Gender (male:female)	13∶30 (30.2% male)	46∶44 (51.1% male)
Age (y)	56.6+/−11.8 (0)	62.5+/−9.5 (0)
BMI (kg/m2)	27.9+/−6.4 (0)	25.9+/−4.6 (2)
FEV1% predicted	91.3+/−15.4 (4)	75.1+/−15.5 (6)
FVC% predicted	95.5+/−15.2 (6)	87.7+/−14.1 (0)
Cardiac diseases	9 (20.9%; 0)	26 (28.9%; 0)
Diabetes	2 (4.7%; 0)	11 (12.2%; 0)
COPD	7 (19.4; 7)	60 (71.4%; 6)
Asthma	1 (2.3%; 0)	2 (2.2%; 0)

Note: Continuous variables are mean+/−SD. The number of missing values is shown between parentheses.