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Unexpected nicotine in Do-it-Yourself electronic cigarette flavourings

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  • Contributors BD planned the study, oversaw the HPLC and wrote the letter. AR performed and analysed the GC-MS data. MC performed and analysed the HPLC data. EN helped plan and design the GC-MS method, and assisted in editing the letter. PT designed the study, contributed to writing the letter and oversaw the project.

  • Funding This work was supported by the National Institutes of Health grant number R011DA036493 and a National Science Foundation Predoctoral Fellowship to BD.

  • Competing interests None declared.

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