Evidence Mounts About the Health Impact of Second Hand Vaping Bisnar Chase Secondhand smoke and secondhand aerosol 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 Smokers Switching to Vaping See Improved Respiratory Health Respiratory Therapy Texas bans the sale of THC vape pens The Texas Tribune Tobacco Smoke, Vaping, and Asthma AAFA.org