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 Trends in long term vaping among adults in England, 2013 23: population based study The BMJ Disposable vapes ban could lead young adults to switch to cigarettes, study finds British Journal of Midwifery Electronic cigarettes for smoking cessation in pregnancy: a nationwide mixed methods study British Journal of Midwifery