Philip Morris USA

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Cigarette filter ventilation is one way that tar yields (as measured by the machine test method) are reduced. The ventilation holes utilized on some of our brands permit the controlled introduction of diluting air into the smoke stream during puffing by the smoker. The diagram above depicts where, as a general matter, ventilation holes are placed on the cigarette filters of our brands that utilize this feature. As noted in the diagram, the holes are placed approximately 12mm from the end of the filter; brands that utilize more than one row of holes place additional rows further from the end.