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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2009 Dec;18(12):3305–3320. doi: 10.1158/1055-9965.EPI-09-1014

Figure 2. Puffing and inhalation patterns showing interindividual variation during the interval between puffing and inhalation31.

Figure 2

Puffing begins during exhalation from points A to B. For some smokers, the smoke is immediately inhaled from the mouth into the pharynx and lungs and completed at point C (A); for others, there is a mouth holding period where point C marks the beginning of the inhalation and completed at D (B); for others, there is an immediate inhalation until point C then an exhalation followed by an larger inhalation at point D (C); others have an immediate exhalation followed by an inhalation from points C to D (D).