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Rare: deafness, Meniere's disease
Observing heterogenous exposure definitions, we also evaluated the impact of omitting observations that used ever-chewing tobacco as the exposure group, keeping only observations that compared current tobacco chewers to nontobacco chewers, and the impact of potential regional differences in chewing tobacco definitions by restricting data to only that from Asian countries, the region with the highest number of chewing tobacco users
But research shows people do not always get the same boost from the gum as they do from the cigarettes themselves
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