Study Finds Powerful Sweetener in Vapes Marketed to Teens Powers Health Young e cigarette users report widespread use of flavor blends and concept flavors like Iced Mango, Blue Dream, and OMG 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 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.