why is chewing tobacco not allowed on planes Can You Use Zyns, or Other Nicotine Products, an Airplane? Is smokeless tobacco (Skoal, etc)

Retrieved February 18, 2020 via NBC News

Decades of science has shown that keeping tobacco products away from youth is critical to reducing the number of people who ultimately become addicted to these products and suffer from tobacco related disease and death. Smoking is the leading cause of preventable death in the country, according to the US Centers for Disease Control and Prevention, even though a 2023 Gallup poll found that the number of people who smoked cigarettes reached record lows

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Any loss in moisture will lead to poor recovery of tobacco so again these areas are generally maintained at about 65%RH at 21C