A scientific review has raised fresh concerns about the long term cancer risks of vaping, concluding that e cigarettes are probably carcinogenic, while also acknowledging significant gaps in the evidence. The analysis of reviews American Cancer Society to vape company: Keep our name outta your mouth Ars Technica 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 Damages DNA and Increases Lung Cancer Risk In Mice Technology Networks