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 What's in an E Cigarette? American Lung Association Researchers Find Toxic Metals in E Cigarette's Johns Hopkins Bloomberg School of Public Health Toxic metal particles can be present in cannabis vapes even before the first use American Chemical Society