history of tobacco in kentucky The Searing Beauty, and Harsh Reality, a Harvest Tobacco Research: A Personal Point
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I'd bet that will change soon

Cotinine can be detected in blood or urine and indicates recent nicotine exposure regardless of the source: cigarettes, cigars, chew, vaping, or nicotine replacement all produce detectable cotinine

They also emit aerosols or vapors (which contain similar chemicals as cigarettes) that are inhaled, contributing to an increased accumulation of bacteria in the mouth and higher risks of infection, cavities, and gum disease

Also, e-cigarettes are often small and easy to conceal

The best sanitation does not help