Many students believe that vaping harmless, which is far from the truth. Vape pens can contain potentially harmful substances such as chemicals linked to lung disease, cancer causing chemicals, heavy metals such as E Cigarettes and Breast Cancer: Is Vaping Really Safer? Vaping harms your health Cancer Institute NSW Vaping harms your health Cancer Institute NSW Disposable vapes might look harmless with their fun colors and sweet flavors, but scientists have just uncovered a disturbing truth: these devices can pack a toxic punch even stronger than regular New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking