Smoking vs Vaping Which Is Worse? Confessions Does Vaping Cause Lung Cancer? Myths and Facts OncoDaily Health effects of electronic cigarettes Wikipedia 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, If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs.