Disposable vapes spew toxic metals at higher levels than cigarettes, study finds The Anatomy and Chemistry of a Disposable Vape Covalent Consumer Vape Products Importance of Shelf Life Studies Turns out the disposable nicotine delivery systems are, as suspected, worse than the real thing, according to a new study from researchers at UC Davis. Elevated Toxic Element Emissions from Popular Disposable E Cigarettes: Sources, Life Cycle, and Health Risks ACS Central Science