Table 1.

Sample Characteristics (n=319)

Years of age	40.34 (±8.27)
% male	51.4
% Caucasian	79.0
% history of asthma	29.2
% history of COPD	6.9
Years regular smoking	24.21 (±9.53)
Fagerstrom FTND	6.68 (±2.23)
Mean cigarettes per day	26.40 (±12.12)
Symptom index	10.04 (±4.71)

COPD, chronic obstructive pulmonary disease; FTND, Fagerström test for nicotine dependence.