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Some of those are strength, pouch moisture, and portion size, as each affects nicotine absorption

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An April 1954 letter from Lorillards research director to the company president states that researchers had found traces of mineral fiber in the smoke: We are embarked upon a program of attempting to work out a method for the elimination of the presence of such fibers. That September, an H&V official sent a memo discussing the need to find a way of anchoring asbestosAll efforts are to be exerted to solve the asbestos-dust-in-Kent smoke problem. In another memo two months later, H&Vs president stated: It is Lorillards belief that asbestos must be eliminated from the Kent cigarette as soon as possible because of a whispering campaign started by their competitors of the harmful effects of asbestos. As a result, H&V would discontinue that part of our research program devoted to the fixing of asbestos fibres and direct the entire attention of the program toward the complete elimination of asbestos. Lorillard nevertheless continued using asbestos in its filters for another 16 months, and sold existing stocks of Kents for several more
Essentially, here's how it typically happens: Rapid Temperature Changes : When a pipe is used, the bowl part, where the tobacco burns, gets very hot
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