The claim that Copenhagen or any other brands of dipping tobacco like Skoal and Grizzly contain fiberglass is a common myth. This theory suggests that the tiny pieces of fiberglass in the tobacco cut the inside of the mouth, making it easier for nicotine to enter the bloodstream.
However, this is not the case. According to both the American Snuff Company and U.S. Smokeless Tobacco Company (which makes Copenhagen), none of their products contain fiberglass. The sharp, gritty feeling often associated with dipping tobacco is actually due to certain flavorings used in the tobacco, not fiberglass [1].
It's also worth noting that the use of fiberglass in oral products would be extraordinarily dangerous. Even small amounts of consumed or inhaled fiberglass can cause throat, stomach, and lung problems, including cancer. Therefore, it would not be in a tobacco company's best interest to include such a dangerous substance in their products [2].
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