Time to spit out chewing tobacco for good in Major League Baseball
California To Big-League Ballplayers: Stop Chewing Tobacco
Tobacco usage in sport - Wikipedia
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The Story Behind Big League Chew, the Shredded Gum That Benched
San Mateo County Tobacco Education Coalition
How Billy Strings Became the Hottest Picker in Bluegrass and Beyond
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The Gross History of Baseball and Chewing Tobacco - Men's Journal
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