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 Impacts of vaping and marijuana use on airway health as determined by exhaled breath condensate (EBC) Respiratory Research Springer Nature Link Disposable e cigarettes are more toxic than traditional cigarettes, study finds Here & Now Disposable e cigarettes more toxic than traditional cigarettes EurekAlert!