Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Secondhand smoke may be a substantial contributor to lead levels found in children and adolescents, new study finds Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. How secondhand smoke, thirdhand smoke & vaping affects kids While vaping is not risk free, it is less harmful than tobacco Our World in Data Children to be better protected from second hand smoking and vaping GOV.UK