Smoking and Tobacco Control Monograph No. 7 
Figure 6 
Mean number (N = 4) of cigarettes smoked by each subject during 3-hour sessions 
as a function of holder number (upper frame) and mean rate of puffing (puffs/ 
minute) per cigarette (lower frame) 
Ventilated Holder 
Note: Standard error values for each subject, in both frames, are indicated by the brackets. The 
approximate concentrations of delivered tobacco product are indicated by the holder number in 
which 0 = too percent, 1 = 75 percent, 2 = 50 percent, and 4=10 percent. The abbreviations 
ST, ED, and GR represent three paid female volunteers who participated in the study. 
Source: Henningfield and Griffiths, 1980. 
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