Table 1: Demographic and smoking characteristics of subjects participating in Experiment 1 and 2.

Experiment 1Experiment 2
Treatment condition5 mA 10 mA 0 mA i5 mA 10 mA
(N = 20)(N = 20)(N = 17) Placebo(N = 20) A proxy of placebo(N = 21)

Gender (N, %)
 Female0 (0)2 (10)2 (12)7 (35)6 (29)
 Male20 (100)18 (90)15 (88)13 (65)15 (71)
Age (years), Mean ± SD30.8 ± 6.4730.5 ± 8.7825.9 ± 4.7523.5 ± 3.5824.7 ± 4.85
Number of cigarettes per day Median (range)20 (15–35)18.5 (15–28)19 (15–28)18.3 (15–25)17.0 (15–23)
Years of smoking Median (range)14 (5–31)13.5 (6–38)9.0 (1–23)7.5 (4–13)8.0 (5–28)
FTND Median (range)5.5 (4–8)5.5 (4–8)7.0 (4–8)7.0 (4–9)6.0 (4–8)