cigarette filter ventilation holes Are Filtered Cigarettes Actually More Dangerous? Why does the filter have

Why does the filter have small holes around it like in the picture? : r Cigarettes The use of charcoal in modified cigarette filters for mainstream smoke carbonyl reduction PMC Effect of Cigarette Type and Smoking Behavior on Urinary Metabolite Levels of Tobacco Associated Toxicants Chemical Research in Toxicology NOVA Online Search for a Safe Cigarette Anatomy of a Cigarette (nonFlash) Limitations in the characterisation of cigarette products using different machine smoking regimes ScienceDirect

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