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Contributors MF wrote first draft of the manuscript. RAK, GWT and MAL revised and edited the manuscript.
Funding This study was funded by grants (DA043468, DA037273) from the National Institute of Drug Abuse.
Disclaimer The views expressed are those of the authors and do not reflect the official views or policy of the Department of Defense or its Components. The views expressed are those of the authors and do not reflect the official views or policy of the National Institutes of Health. The voluntary, fully informed consent of the subjects used in this research was obtained as required by 32 CFR 219 and DODI 3216.02_AFI 40-402. The views of JUUL are not necessarily the official views of, or endorsed by, the US Government, the Department of Defense or the Department of the Air Force. No Federal endorsement of JUUL is intended.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Data availability statement There are no data in this work.
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