Table 1—
Characteristics of the 3 smokers groups
Group 1
Group 2
Group 3
Total
Start
03/05/2004
12/10/2004
03/10/2005
N (male/female)
16 (5/11)
14 (5/9)
8 (0/8)
38 (10/28)
Mean age yrs
47
43
53
48
Exhaled CO ppm
15.56
10.53
27.00
17.69