biostudies-literatureSoule EKNational Institute of Environmental Health SciencesCenter for Tobacco ProductsNIDA NIH HHSNIEHS NIH HHSLouisiana Clinical and Translational Science CenterU.S. Food and Drug AdministrationNational Institutes of HealthNational Institute of General Medical SciencesNIDDK NIH HHSNational Cancer InstituteNCI NIH HHSNational Institute on Drug AbuseNIDDKNIGMS NIH HHS412-420https://www.ebi.ac.uk/biostudies/studies/S-EPMC9910146biostudies-literatureUnknown25(3)<h4>Introduction</h4>Electronic cigarettes (ECIGs) heat a nicotine-containing liquid to produce an inhalable aerosol. ECIG power (wattage) and liquid nicotine concentration are two factors that predict nicotine emission rate ("flux"). These factors can vary greatly across devices and users.<h4>Aims and methods</h4>The purpose of this study was to examine ECIG device and liquid heterogeneity in "real world" settings and the association with predicted nicotine flux, nicotine yield, and total particulate matter (TPM) emissions. Past 30-day ECIG users (n = 84; mean age = 23.8 years [SD = 9.6]) reported device and liquid characteristics. Device power was measured via multimeter, device display screens, or obtained via labeling. Liquid nicotine concentration was obtained via labeling or through Nicotine & tobacco research : official journal of the Society for Research on Nicotine and TobaccoElectronic Cigarette Nicotine Flux, Nicotine Yield, and Particulate Matter Emissions: Impact of Device and Liquid Heterogeneity.PMC9910146P30 DK072476R15ES032138U54 GM104940U54DA036105R21 CA239188R15 ES032138U54 DA036105Fuemmeler BFSnipes WTalih SMartin CKEissenberg TSoule EKTheall TDo EKHochsmann CMayne SfalseElectronic Cigarette Nicotine Flux, Nicotine Yield, and Particulate Matter Emissions: Impact of Device and Liquid Heterogeneity.<h4>Introduction</h4>Electronic cigarettes (ECIGs) heat a nicotine-containing liquid to produce an inhalable aerosol. ECIG power (wattage) and liquid nicotine concentration are two factors that predict nicotine emission rate ("flux"). These factors can vary greatly across devices and users.<h4>Aims and methods</h4>The purpose of this study was to examine ECIG device and liquid heterogeneity in "real world" settings and the association with predicted nicotine flux, nicotine yield, and total particulate matter (TPM) emissions. Past 30-day ECIG users (n = 84; mean age = 23.8 years [SD = 9.6]) reported device and liquid characteristics. Device power was measured via multimeter, device display screens, or obtained via labeling. Liquid nicotine concentration was obtained via labeling or through 2023-01-01T00:00:00Z2023 Feb2025-04-04T20:04:20.659Z2025-04-04T20:04:20.659ZS-EPMC99101463596526010.1093/ntr/ntac196