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Use of electronic nicotine-delivery systems (ENDS), specifically electronic cigarettes (also known as e-cigarettes), among young people between the ages of 10 and 24 years has increased substantially in the past 5 years. In fact, more than one-third of high school seniors in the United States report e-cigarette use in the past year. While ENDS have been hypothesized to contain fewer harmful emissions than traditional cigarettes, research has shown that they are not without risk, and ENDS aerosols often contain high levels of nicotine, heavy metals, and carcinogens. [...]