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The percentages of fruit flavor use across waves ranged 67.871.9% among youth, 56.264.4% among young adults, and 34.746.3% among adults (Figure 1)

Cigarette samples received from Myanmar were found to contain carbon monoxide (CO) levels exceeding 10 mg per cigarette

First, if we assume that e-cigarettes are used as a smoking cessation aid, we hypothesize that smokers with respiratory symptoms at baseline are more likely to initiate e-cigarette use than smokers with fewer symptoms (hypothesis 1)

doi: 10.3389/fphys.2022.1037750 Received 06 September 2022 Accepted 05 December 2022 Published 15 December 2022 Volume 13 - 2022 Edited by Fernanda Priviero, University of South Carolina, United States Reviewed by Thomas Muenzel, University Medical Centre, Johannes Gutenberg University Mainz, Germany Fabiola Zakia Mnica, State University of Campinas, Brazil Updates Copyright 2022 Kopp