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On the popularity of the USB flash drive-shaped electronic cigarette Juul

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  • Contributors RK conceived the study, designed the data collection process and wrote the paper. SH collected the Twitter data; RK and SH performed associated analysis. EJH guided the study and reviewed drafts making important modifications.

  • Funding This work was supported by the U.S. National Cancer Institute through NIH grant R21CA218231.

  • Disclaimer The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.

  • Competing interests None declared.

  • Patient consent Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.