Bull. Spec. CORESTA Congress, Lisbon, 2000, p. 207, STPOST4
A new method for assessing the level of filter vent blocking by smokers
Altadis - Imperial Tobacco Group, Research Center, Fleury les Aubrais, France
Vent blocking, the inadvertent or deliberate covering of the filter ventilation zone by the smoker, may increase the smoke yields. To date, several techniques have been used to assess the incidence of vent blocking: filter tar staining pattern, video...