Aluminium, copper, nickel, lead and zinc in e-liquids from contemporary disposable vapes.
Level 5 - mechanism / opinion, no new human data
Oxford CEBM level 5 (bench analytical chemistry study without human participants)
PubMed 41872591 · doi:10.1007/s10661-026-15145-z
What was done
E-liquids extracted with dilute nitric acid from 44 used and 3 new fourth-generation disposable e-cigarettes of various brands and flavours were analyzed for metal and metalloid concentrations using inductively coupled plasma-optical emission spectrometry (ICP-OES). Theoretical human inhalation exposures per device were estimated using mass balance calculations comparing new and used devices.
What was found
Elements including As, Ba, Cd, Co, Cr, Mn, and V were rarely detected and never exceeded 10 mg/kg. In contrast, Al, Cu, Ni, Pb, and Zn spanned several orders of magnitude, with Ni and Pb frequently exceeding 100 mg/kg and Cu and Zn regularly exceeding 1000 mg/kg. Cu, Pb, and Zn concentrations progressively increased as extract mass decreased in used devices. Mass balance models estimated potential maximum inhalation exposures per device of up to 8000 μg of Cu, 500 μg of Pb, and 6000 μg of Zn.
Why it matters
This study identifies substantial contamination and progressive concentration of hazardous heavy metals in contemporary disposable e-cigarettes, highlighting inhalation toxicity risks for consumers and environmental hazards from discarded devices.
Limits
The study evaluated a modest sample size, particularly for baseline unused controls (n = 3 new vs. 44 used devices). Actual user aerosol exposure and internal biomarkers were not measured; inhalation figures rely entirely on mass balance approximations. Precise puffing patterns, device usage history, and brand-specific baseline variations were not controlled.
Cited by
- supports A single disposable vape can release more lead in one day of use than smoking 20 packs of cigarettes.