Disposable e cigarettes more toxic than traditional cigarettes EurekAlert! 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 Are e cigarettes really a safer alternative to combustible cigarettes? New study reveals disposable vapes may be more toxic! Learn more about how a University of California, Davis study found that some popular Lead in Vapes: Toxic Metals Found in Disposable E Cigarettes Technology Networks