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The original version of the Kent Micronite cigarette filter used crocidolite, a form of asbestos, from 1952 until at least mid-1956. Cigarettes from intact, unopened packs of the brand from this period were examined. One filter contained approximately 10 mg of crocidolite. Crocidolite structures were found in the mainstream smoke from the first two puffs of each cigarette smoked. At the observed rates of asbestos release, a person smoking a pack of these cigarettes each day would take in more than 131 million crocidolite structures longer than 5 pm in 1 year. These observations suggest that people who smoked the original version of this cigarette should be warned of their possible substantial exposure to crocidolite during the 1950s.

An epidemic of asbestosis, lung cancer, and mesothelioma has occurred among workers at the factory where the filters for the original Kent cigarette were made.

KENT'S micronite filter was made out of asbestos. Many people who smoked these cigarettes came down with mesothelioma, the hallmark cancer that results from asbestos exposure.

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