Researchers now warn that nicotine based e cigarettes are likely carcinogenic, meaning they have the potential to cause cancer, specifically in the lungs and mouth. Learn more in our weekly news roundup. https: t.co i4xGiCxD0t E cigarettes: 'cancer risk close to zero' Bhekisisa 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 Broad evidence implicates e cigarettes as a cause of cancer Stanton Glantz blog Lung cancer risks persist with e cigarette use after quitting tobacco smoking