Study: Potent sweetener neotame found by researchers in popular vapes 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 Tobacco is Changing: E Cigarettes Wisconsin Department of Health Services Study: average Indiana resident spends $543 a year on disposable vapes Study: Partial Flavor Ban on Vapes Had Addiction Consequences for American Students UW CTRI UWMadison