Table 1 Participant characteristics

Race (%)

White

35 (69)

22 (71)

13 (65)

0.60

Black

11 (22)

7 (23)

4 (20)

Other

5 (9)

2 (6)

3 (15)

Means ± (SEMs)

Age

34.2 (1.6)

36.2 (2.0)

30.9 (2.5)

0.10

Education

14.4 (0.3)

14.3 (0.3)

14.7 (0.6)

0.52

Cigarettes per day

15.6 (0.8)

16.9 (1.0)

13.6 (1.2)

0.04*

Pack years^a

12.5 (1.6)

15.2 (2.4)

8.4 (1.6)

0.04*

FTND scores

4.5 (0.2)

4.7 (0.3)

4.3 (0.5)

0.44

Craving scores^b

0.8 (0.2)

0.8 (0.3)

0.9 (0.4)

0.93