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Despite the growing prevalence of digital cigarette (e-cigarette) use, particularly among young adults (1), little is understood about their actual-world use (2). For Vape e-Juices Stores instance, Vape E-Liquids info is lacking on most popular product sorts ("closed-system" or Vape e-Juices Stores first generation models, which use disposable Buy E-Liquid cartridges that require substitute, versus "open-system" or second and third generation models, which require the person to refill the e-cigarette tank).