Study: Some vapes release more lead than 20 packs of cigarettes The dangers of e cigarettes: Why UC Davis says they are more toxic than traditional cigarettes WARNING FOR AND Illegal disposable e cigarettes (vapes) may be more dangerous than traditional cigarettes, according to new research from UC Davis. The study found hazardous levels of toxic heavy metals Impacts of vaping and marijuana use on airway health as determined by exhaled breath condensate (EBC) Respiratory Research Springer Nature Link