Table 1.

Patients' baseline characteristics.

	NNS 1 dose per hour/12 h a day	NNS Dose when cravings appear (control)
	n = 25	n = 25
Age
Mean (SD)	40.2 (11.4)	40.8 (10.1)
Sex
% male*	60%	84%
Education
% high school/university	52%	58.3%
Health
Psychiatric comorbidities*	44%	24%
Smoking habits
Daily intake; mean cig/day (SD)	29.8 (11.4)	30 (10.3)
Baseline CO (ppm); mean (SD)	42.0 (16.1)	40.9 (19.0)
Years of consumption; mean (SD)	18.9 (11.0)	21.0 (9.0)
Previous attempts; mean (SD)*	2.2 (1.7)	3.1 (3.1)

*Over 20% relative difference between groups.

Cig: cigarettes; CO: carbon monoxide; SD: standard deviation.