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Comparison of biomarkers of exposure among US adult smokers, users of electronic nicotine delivery systems, dual users and nonusers, 2018–2019

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10163269/?fbclid=IwAR2ftvFV6mySHe3HmGPMsJK_N1IJp-IWltXYpcYN27cp3OyjLnbbgEoYyHE

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