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To support FDA's efforts, NIH and FDA are collaborating to foster research on tobacco product addictiveness, toxicity, appeal, and other characteristics that will provide additional scientific foundation for developing a regulatory framework, including potential tobacco product standards (NIH and FDA 2012)

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American Lung Association, State Legislated Actions on Tobacco Issues (SLATI)

The short answer is yes

For years it was thought that nicotine being a vasoconstrictor was causing less blood flow to the gums, causing less infection-fighting white blood cells to reach the area