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Schematic illustration of inhaled cigarette smoke puff and inhalation (dilution) air: (A) Inhaled air is represented by dilution volumes Vd1 and Vd2 and particles bolus volume Vp; (B). The puff occupies volumes Vd1 and Vp; (C). The puff occupies volume Vd1 alone. Deposition fraction in (A) is the difference in deposition fraction between scenarios (A) and (B).
