A new study from UC Davis found that disposable vapes have much higher concentrations of heavy metals like lead and nickel than traditional cigarettes. CBS Evening News Facebook Study: Partial Flavor Ban on Vapes Had Addiction Consequences for American Students UW CTRI UWMadison Tobacco is Changing: E Cigarettes Wisconsin Department of Health Services Deconstructing contemporary disposable vapes: A material and elemental analysis ScienceDirect