A new study from UC Davis found that disposable vapes have much higher concentrations of heavy metals like lead and nickel than traditional cigarettes. CBS Evening News Facebook Trends in long term vaping among adults in England, 2013 23: population based study The BMJ Elevated Toxic Element Emissions from Popular Disposable E Cigarettes: Sources, Life Cycle, and Health Risks ACS Central Science Study: Potent sweetener neotame found by researchers in popular vapes