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of copper from pigments used in the papers might result in exposures as high as 4.5-11 times the maximum exposure limits.

Permeability is defined as the measure of the volume of air that flows through a specified area of cigarette paper in a given unit of time. It is measured in CORESTA units. US commercial filter cigarette brands have paper permeability between 14 and 51 CORESTA units. Increased cigarette paper permeability results in increased smoke dilution with air.

Fire-resistant cigarettes,

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