E cigarettes and cancer E cigarettes are likely to cause cancer, including in the lungs and mouth, according to a sweeping review of scientific evidence that challenges their positioning as a safer alternative to smoking. There is Although research on cancer risks associated with vaping is still limited, a 2025 systematic review found substantial evidence that e cigarette exposure is associated with biomarkers reflective of cancer disease risk. This includes Misconceptions Over The Safety Of Vaping and E Cigs Is Risking Lives Ecigclick Misconceptions about e cigarette safety might be stopping smokers using them to quit