Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Many people believe that vaping is less harmful than smoking, but that's a common misconception. In fact, in addition to nicotine, vapes can contain toxic chemicals that could be linked to cancer, Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times How Smoking vs Vaping Affects Your Lungs You Must See This ! !