Disposable vapes are more toxic than cigarettes, contain lead: Study 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 Years ago, vaping was thought to be a way to stop smoking. However, in the following decades other troubles come from vaping including very high levels of nicotine delivery, battery explosions Disposable e cigarettes more toxic than traditional cigarettes EurekAlert! Flavored tobacco sales restrictions and e cigarette use among California high school students