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history of chewing tobacco Evolution products: recent and future directions Chewing tobacco | Health Risks,

Name: history of chewing tobacco Evolution products: recent and future directions Chewing tobacco | Health Risks,
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Chewing tobacco Health Risks, Addiction & Cessation Britannica File:Formosa, chewing tobacco label, 1872.jpg Wikimedia Commons Chew: Horse head tobacco Digital Commonwealth The Right Snuff Pittsburgh Magazine History of Copenhagen Smokeless Tobacco

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This requires two modifications to the baseline specification: (1) drop cigsale(1988) from the predictors because it would be post-treatment relative to the fake date, and (2) shorten the predictor averaging window to xperiod(1980(1)1984)