Vaping May Be More Dangerous Than Cigarette Smoking, Studies Show University Hospitals 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, Will Vaping Lead Teens to Smoking Cigarettes? Johns Hopkins Medicine Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Health Issues What's the Harm? Texas DSHS