Differing Opinions About Second Hand Vape Exposure Vaping Post Ever puffed a vape around others thinking it's harmless? Think again. Inhaling vapor from e cigarettes exposes you to harmful chemicals, such as formaldehyde. These toxic substances can be passed on to Experts urge parents not to vape near kids as study finds second hand vapor causes build up of chemicals linked to CANCER Daily Mail Online Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London