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Heavy exposure to electronic cigarette vapor damages DNA in cell cultures, causing genetic instability that could lead to cancer, according to a study by VA San Diego Healthcare System and University of California, San Diego, researchers. Moreover, even nicotine-free vapor induces this damage, indicating that other substances in e-cigarettes can damage cells, the study stated. The study won’t come close to scientifically settling whether e-cigarettes represent a great new danger, a harmless diversion, or something in between. It does provide more grounds for suspicion that e-cigarettes are not entirely benign, and carry health risks of an unknown magnitude. Worldwide attention has been focused on e-cigarettes as a possible means of weaning smokers off tobacco, or alternatively as a new public health menace. But since e-cigarettes became popular scarcely a decade ago, there hasn’t been time to collect long-term evidence, such as the population studies that linked smoking to lung cancer. But seriously, people, it's not wise to swap one addiction for another.