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The breakthrough "nicotine salts" formula that made the Juul e-cigarette so addictive and ignited the company's explosive market-share growth made Juul especially attractive to teenagers and other new users who otherwise would never have smoked cigarettes, according to interviews with more than a dozen tobacco researchers, pediatricians, and a Reuters review of Juul patents and independent research on nicotine chemistry

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New York City, for example, only allows retailers to sell tobacco products that are unflavored or that have tobacco, menthol, mint , or wintergreen flavoring

Current Pain and Headache Reports, 14 (2), 8895