Australia Adds Vape Graphic Warnings Tobacco Reporter Vaping cannabis found to expose lung cells to toxic and cancer linked substances E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Can vaping cause cancer? The evidence suggests it might. 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