Can Vaping Cause Lung Cancer? Here's What We Know The Lung Docs Lead in Vapes: Toxic Metals Found in Disposable E Cigarettes Technology Networks 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 Disposable vapes are more toxic than cigarettes, contain lead: Study New study finds disposable vaping devices more toxic than traditional cigarettes