Table 2 Daily smoking habits, habit duration in years, FTND, and mean values

Daily number of cigarettes (cigarettes/day)

   1-10

78.5

   11-20

12.3

   21-30

9.2

Smoking duration (years)

   1-5

13.3

   6-10

41.7

   11-15

33.3

   > 16

11.7

FTND†

   Light smoker

90.8

   Moderate smoker

3.1

   Heavy smoker

6.1

Mean values (SD)

   Age at first tobacco use‡

16.7 (2.98)

   Years of smoking*

10.4 (4.36)