Vaping before, during and after pregnancy: leaflets and infographics ASH Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand Vape Exposure: Effects, Who's at Risk, and More Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Exposure to Thirdhand Smoke Harms the Health of Pregnant Women Thirdhand Smoke Resource Center