Lead in Vapes: Toxic Metals Found in Disposable E Cigarettes Technology Networks PDF) Disposable Puff Bar Electronic Cigarettes: Chemical Composition and Toxicity of E liquids and a Synthetic Coolant A new study from the University of California, Davis, reveals that popular disposable vapes from brands like ELF Bar, Esco Bar, and Flum Pebble emit more lead than smoking 20 packs of Your Vape Pen Might Be Full of Lead Pulmonary toxicity of e cigarettes American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society