Table 1.

Baseline data (Q1 = quartile 1; Q3 = quartile 3).

Baseline	e-Cig (n = 20)	THS (n = 20)	p Value
No. of smokers screened to fill the group	62	53
Mean age (SD)	50.5 (7.0)	49.15 (7.0)	0.546
Median cigarette/day (Q1–Q3)	20 (20-20)	20 (20–21.59	0.333
Mean Fagerstrom score (SD)	4.6 (1.6)	6.7 (1.3)	0.001
eCO
Median %COHb (Q1–Q3)	1.92 (1.6–2.8)	1.92 (1.6–2.5)	0.849
Median ppm (Q1–Q3)	12 (10–17.5)	12 (10–15.8)	0.849