Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times California recalls cannabis vape months after it was told of contamination Los Angeles Times The solution? Or the next problem? The Effects of Flavored Nicotine Dangers of Vaping Chart Poster Composition of electronic cigarette aerosol Wikipedia Do you really know what's in your vape? There's no safe vape. Besides nicotine, vapes contain many other harmful substances. Formaldehyde, arsenic and lead have all been found inside common vapes.