New strong evidence that Juul is more toxic to lungs and hearts than earlier e cigs Stanton Glantz blog 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 Smoking or vaping both harm your health., They damage your lungs, strain your heart, weaken immunity, and reduce overall well being., Choosing less harmful doesnt mean choosing safe., Your health What are the effects of vaping on teen lungs? Baptist Health Jacksonville What Does A JUUL Really Do To Your Body? Franciscan Health