Researchers found that mice exposed to vapor from e-cigarettes experienced DNA damage in the lungs, bladder, and heart, which could increase the risk of cancer and heart disease.

Such damage was also found in cultured human lung and bladder cells that had been exposed to e-cigarette vapor for the equivalent of 10 years.

Study co-author Moon-shong Tang, of the Department of Environmental Medicine at the New York University School of Medicine, and his colleagues recently reported their findings in the Proceedings of the National Academy of Sciences. E-cigarettes have soared in popularity in recent years, particularly among teenagers and young adults.