A recent study concludes that people who smoke electronic cigarettes are twice as likely to report clinical depression as those who have never vaped. The correlation was particularly strong among younger people.

Known as vaping, battery-powered e-cigarettes use heat to deliver an aerosol cocktail of nicotine and flavors to the user. An e-cigarette produces a small cloud of vapor, whereas a cigarette releases smoke.

Many people believe that the vapor contains water. In fact, it contains varying amounts of toxic chemicals that have links to heart and respiratory diseases, as well as cancer.

The use of e-cigarettes in the United States has snowballed since their introduction a decade ago.

According to the Annals of Internal Medicine, in 2016, an estimated 10.8 million people in the U.S. used e-cigarettes. Of this number, 2.8 million (9.2%) were 18–24 years old.

Today, some experts consider vaping to be an epidemic among teenagers — the number of high school students who turned to vaping doubled in 2018.

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