UNITED NEWS INTERNATIONAL (UNI) —Two million middle and high school students used e-cigarettes and other electronic nicotine delivery systems in 2016.

That trend, according to the Food and Drug Administration and the Federal Trade Commission, needs to end.

The two agencies teamed up on Tuesday, May 1, sending out 13 warning letters to manufacturers, distributors and retailers for selling e-liquids used in e-cigarettes that contain misleading labeling geared toward kids.

The agencies said the labeling and advertising resembled kid-friendly food products, such as juice boxes, candies or cookies.

Several companies that got warning letters also were cited for illegally selling the products to minors.

Maureen Ohlhausen, acting FTC chair, said protecting children was the agency’s highest priority.

More than 8,200 e-cigarette and liquid nicotine exposures occurred among children younger than 6 years old.

For small children, exposure to the nicotine in e-liquid products, even in small amounts, could reportedly lead to death.