Known Health Effects of E Cigarette Use Kansas Health Institute E cigarettes contain hazardous substances, addictive and harmful Electronic Nicotine Delivery Systems (ENDS), including e cigarettes and vapes, are often perceived as a safer alternative to traditional tobacco. But is the evidence really supporting this belief? A recent umbrella review published Analysis of physicians' statements on electronic cigarettes in YouTube videos in Trkiye: a thematic content analysis BMC Public Health Springer Nature Link Harmful Effects of Vaping Chart Health Edco E Cigarettes and Pregnancy Maternal Infant Health CDC