Chapter 10 
Figure 2 
Influence of smoking parameters on constituent yield 
(mg/cigarette) 
Key: low = 1 7-mL puff volume, 1 -second duration, 1 puff/minute; FTC = 35-mL puff volume, 2-second duration, 1 puff/ 
minute: FTC+ = same as FTC plus butt end taped; average = 45-mL puff volume, 2-second duration, 2 puffs/ 
minute; high = 75-mL puff volume, 3-second duration, 3 puffs/minute; high-r = same as high plus butt end taped; 
NF = nonfilter; F = filter; VF = ventilated filter. 
Source: Jenkins et a!., 1982. 
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The Rickert and colleagues (1983), Darrall (1988), and Jenkins and 
colleagues (1982) studies all considered the effect of increasing the puff 
frequency from one per minute to two per minute. Puff volumes varied 
from 40 to 48 mL across the studies, but the results were similar. Smoking 
at two puffs per minute approximately doubled the tar yield for most 
products tested. 
Filter ventilation also has been considered. The Jenkins and colleagues 
(1982) data illustrated that 100 percent ventilation blockage increased the 
tar delivery by a factor of 10 to 20 for very low (< 1 mg) FTC tar products 
if all other smoking parameters were kept constant. Kozlowski and 
coworkers (1982) reported increases of a factor of 20 to 40 using conditions 
of 100 percent blockage, a 47-mL puff volume, and a 44-second puff interval 
for products rated as <1 mg FTC tar. The influence of ventilation blockage 
was smaller but still important for products rated as 1 to 6 mg FTC tar (2 to 
6 times increased delivery compared with that measured using the FTC 
method without ventilation blockage), was readily detectable for products 
147 
