New strong evidence that Juul is more toxic to lungs and hearts than earlier e cigs Stanton Glantz blog Vaping, Environmental Toxicants Exposure, and Lung Cancer Risk 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 What is the JUUL? Dana Farber Cancer Institute Vaping and Lung Cancer Screening Capitol Imaging Services