Smoking and Tobacco Control Monograph No. 7 
Figure 9 
Linear relationships between nicotine yield and puffing topography measures: 
(A) number of puffs per cigarette, (B) total puff duration per cigarette, (C) total 
puff volume per cigarette 
y 
Nicotine Yieid (mg/cigarette) 
y 
Nicotine Yieid (mg/cigarette) 
y 
Nicotine Yieid (mg/cigarette) 
Note: The graphical representation for each of these relationships includes the equation for the 
inserted least-squares best fit line, the correlation coefficient (r), and the level of significance 
for the correlation. The data are for groups 1-4, n = 108. 
Source: Bridges et al., 1990. 
268 
