Table 1.

Demographics of the participants

	Smokers	Healthy controls
Number	88	88
Age	32.3 ± 8.7	31.6 ± 8.0
Gender	44 M, 44 F	44 M, 44 F
FTND	5.4 ± 1.9	–
CPD	19.8 ± 7.2	–
Smoking years	14.0 ± 7.6	–
Lifetime usage	13.7 ± 9.4	–

FTND: Fagerström Test for Nicotine Dependence; CPD: cigarettes per day; Lifetime usage: measured in pack‐years (=CPD × smoking years/20); M/F: male/female.

Age, FTND, CPD, smoking years and lifetime usage are calculated as mean ± SD.