• to compare ONS, two sprays of 1 mg nicotine, and one Tabex tablet of 1.5 mg cytisine after 12 hours of overnight abstinence with respect to reduction of urges to smoke during the first 5 minutes after start of treatment, and • to compare the two treatments with respect to the urges-to-smoke scores at 30, 45, and 60 seconds, 3 and 5 minutes vs. baseline.