Can Vaping Cause Lung Cancer? Here's What We Know The Lung Docs 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 UC Davis Tobacco Reporter Disposable vapes are more toxic than cigarettes, contain lead: Study Elevated Toxic Element Emissions from Popular Disposable E Cigarettes: Sources, Life Cycle, and Health Risks ACS Central Science