E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Does Vaping Cause Lung Cancer? 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 Vaping Causes Lung Cancer? Vaping vs Smoking Dr Tho Lye Mun VAPING IS NOT SAFE AND THE CANCER WARNING IS NOW MUCH STRONGER For years, vaping was sold as the safer option. But safer than cigarettes does not mean safe. A major Australia Adds Vape Graphic Warnings Tobacco Reporter