Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis 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. Clearly flavored: the rise of clear e cigarettes The Anatomy and Chemistry of a Disposable Vape Covalent British Journal of Midwifery Electronic cigarettes for smoking cessation in pregnancy: a nationwide mixed methods study British Journal of Midwifery