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Smoking bars, which include cigar lounges and hookah bars, are establishments that exclusively occupies an enclosed indoor space and is primarily engaged in the retail sale of tobacco products for consumption by customers on the premises.10 Licensing laws Retailers and wholesalers are required to obtain a license to sell tobacco products.6 A license is required to sell e-cigarette products.9 The sale of tobacco products in pharmacies is prohibited.11 Youth access laws Effective December 2019, the United States adopted a law raising the federal minimum age of sale of all tobacco products to 21

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doi:10.1136/bmj.315.7114.973

The variables were adjusted for sex, age, income, and education level