Disposable Vapes Release More Toxic Metals Than Traditional Cigarettes: UC Davis Study The Epoch Times They may look harmless and smell sweet but disposable vapes can release toxic metals at levels even worse than cigarettes. A UC Davis study found lead, nickel, and antimony inside UC Davis study reveals higher toxicity in disposable e cigarettes YouTube Design Features in Multiple Generations of Electronic Cigarette Atomizers New study finds disposable vaping devices more toxic than traditional cigarettes