A new study from UC Davis found high levels of heavy metals in popular nicotine vapes adding to growing concerns about the real risks of vaping. Vaping puts stress on the cardiovascular Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis Impacts of vaping and marijuana use on airway health as determined by exhaled breath condensate (EBC) Respiratory Research Springer Nature Link Disposable Vapes Release More Toxic Metals Than Traditional Cigarettes: UC Davis Study The Epoch Times