Monitoring E Cigarette Trends in the United States Disposable e cigarettes are more toxic than traditional cigarettes, study finds Here & Now Disposable vapes more toxic and carcinogenic than cigarettes, study shows 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 UC Davis Tobacco Reporter