First off, there has never been any fiberglass in any cigarettes. Ever.
This question comes from an old rumor that Menthol Cigarettes are bad for you. Due to the fact that menthols are popular with African Americans (49.5% of all cigarettes sold to blacks in America were Newport, a menthol flavored cigarette, many more bought Kool, another menthol brand) people assume there is a huge conspiracy.
The fact is, menthol cigarettes are made from peppermint oils, and are no more dangerous than any other cigarette.
It is possible that this particular urban myth/conspiracy theory/paranoid delusion is fueled in part by the common practise in the earlie days of filter cigarette production of using asbestos in the filter, especially Kent brand. While substances such as activated charcoal are used in some filters, the primary material of cigarette filters today is cellulose acetate.
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