The rise of teen vaping is worrying doctors worldwide. While e cigarettes were once marketed as a safer alternative, research shows they contain nicotine, heavy metals, and cancer causing chemicals that can damage developing We were shocked': Vaping considerably increases lung cancer risk among people who smoke Use of e cigarettes after quitting smoking increases lung cancer risk Cancerworld Magazine Is There a Link Between Vaping and Lung Cancer? E Cigarette Smoke Causes Lung Cancer in Mice NYU Langone News