Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. In secondhand vape, scientists smell risk American Heart Association Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Vaping and Pregnancy: Are E Cigarettes Really Any Safer for You and Your Baby? The Impact of Thirdhand Smoke on Kids Johns Hopkins Medicine