Table 1. Descriptive characteristics of the study population.

n	236
Age (years; mean±SD)	51.2±12.9
Smoked cigarettes/day	21.2±8.4
FTND score (mean±SD)	6.3±1.2
CO level (ppm) (mean±SD)	19.0±8.7
MNWS score (mean±SD)	12.01±6.1
Heavy smokers (≥20 cigarettes/day)	31.8%
COPD	48.3%
First cigarette under age of 18	43.8%
ZSDS score (mean±SD)	37.7±7.4
ZSDS score above 48	7.5%
Smoking parents	79.7%
Anxiety disorders	10.9%
MDD	9.5%

FTND, Fagerström Test for Nicotine Dependence; MNWS, Minnesota Nicotine Withdrawal Scale; COPD, chronic obstructive pulmonary disorder; ZSDS, Zung Self-Rating Depression Scale; SD, standard deviation; MDD, major depressive disorder.