Table 1.

Baseline characteristics of the study groups.

Characteristic	Electronic cigarette users (n = 45)	Smokers (n = 35)	p-value
Age (years)	38 ± 5	37 ± 5	0.219
Gender (male)	35 (77.8%)	26 (74.3%)	0.716
Cigarette consumption (number per day)	26 ± 8	24 ± 5	0.125
Smoking duration (years)	21 ± 6	19 ± 5	0.151
Brinkman index	571 ± 258	451 ± 178	0.021
Electronic cigarette use (months)	7 ± 3
Electronic cigarette consumption (mL/day)	5 ± 2

Data expressed as mean ± SD or number (%). Brinkman index: product of daily number of cigarettes consumed and years of smoking.