Electronic-cigarette smoke (ECS) is promoted as a safe alternative of tobacco smoke to deliver nicotine and has been rapidly gaining popularity rapidly in younger populations. Recent research shows that mice exposed to ECS sustained extensive mutagenic DNA damages and diminished DNA repair in mouse lungs and bladder mucosa. These effects were caused by nitrosamines, the nitrosation products of nicotine, a major component of ECS. Our most recent experimental evidence demonstrates that mice exposed to ECS developed adenocarcinomas of lung and urothelial hyperplasia of the urinary bladder. These results indicate that ECS is a lung carcinogen and a potential bladder carcinogen. We strongly urge heightened public awareness of the significant harmful effects of ECS. Dr. Moon-Shong Tang is a professor at NYU School of Medicine in the Department of Environmental Medicine and Department of Pathology.
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