Strong evidence shows vaping likely causes cancer. Time to rethink that vape? #FlyingKetchup Does Vaping Cause Lung Cancer? New research released today from UNSW has shown the strongest evidence yet that vaping likely causes cancer, with early signs like DNA damage already detected. While the long term evidence is still emerging, 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 Patients With Cancer Who Vape Are at Significant Risk for EVALI Cancer Therapy Advisor