They are battery-powered devices filled with a solution of liquid, nicotine, water, and propylene glycol. When you take a puff of one, a battery heats up the solution and creates a vapor that you inhale.
There are many different types of e-cigarettes.
Juuls, which are small and thin, are particularly popular among teenagers.
According to Harvard Public, while e-cigarette use has soured over the past few years, combustible cigarette use has dropped to 9%, the first time teen smoking rates in the U.S. have ever hit single digits.
It is plausible that e-cigarettes are diverting teens away from combustible cigarettes. While it is a good sign that teens are diverting usage from far more dangerous cigarettes, the potential long term effects from e-cigarettes are still threatening the to young population especially considering the lack of general knowledge of the negative health-effects on teens developing lungs.