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A new study confirms that e-cigarettes are harmful to teenagers and urges adolescents to stop putting their health at risk. They offer users a similar sensation to smoking, but they do not produce smoke. Instead, they heat up the e-liquid they contain and create vapor, which is why using these devices is sometimes referred to as "vaping." However, while many adult users opt for e-cigarettes to ease themselves out of their  smoking habit , some researchers have  raised concerns  that teenagers may be using them as a gateway into this very habit.