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mages of four cigarette filters showing the state of filter blockage. Download Scientific Diagram Cigarettes used as focus group stimuli. (A) Longer length brown Download Scientific Diagram Why does the filter have small holes around it like in the picture? : r Cigarettes I opened up a cigarette from curiosity (I dont smoke) I cut the filter part from the tobacco part and saw the upper bit of the filter had black parts and the Effect of charcoal containing cigarette filters on gas phase volatile organic compounds in mainstream cigarette smoke Tobacco Control

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