Vaping While Pregnant? Duke Study Reveals Dangers to Fetal Growth and Development in Mouse Model Duke Health Disposable vapes are more toxic than cigarettes, contain lead: Study 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. Vape ban Australia: Fewer school age children vaping, study says Consumer Vape Products Importance of Shelf Life Studies