Knock Out Nicotine: Dangers of Vaping Warfighter Wellness She filled her vape up to five times a day. Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center How safe is vaping? UCLA Health 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, Are vape pens, or e cigarettes, ever the better option? Ohio State Health & Discovery