WASHINGTON (AP) — Juul Labs said Thursday it will halt U.S. sales of its best-selling, mint-flavored electronic cigarettes as it struggles to survive a nationwide backlash against vaping.

The voluntary step comes days after new government research showed that Juul is the top brand among high schoolers who use e-cigarettes and that many prefer mint.

“These results are unacceptable,” said the company’s CEO K.C. Crosthwaite, adding in a statement that the company must “earn the trust of society.”

Underage vaping has reached what health officials call epidemic levels. In the latest government survey, 1 in 4 high school students reported using e-cigarettes in the previous month, despite federal law banning sales to those under 18.

Under fire for its alleged role in sparking the vaping craze among teens, Juul has made a series of concessions to try and weather a crackdown from local, state and federal officials. It stopped selling popular fruit and dessert flavors in stores last year, and last month, stopped selling them online, too.

Earlier, the company replaced its CEO and pledged to stop advertising its products. For years, Juul has argued that its e-cigarettes are intended to help adult smokers switch to a less harmful nicotine product. But its early marketing campaigns were mainly on social media and featured young, stylish models. The company subsequently shuttered its Facebook and Instagram accounts.

After halting mint sales, Juul will only sell menthol and tobacco flavors. Mint and menthol accounted for nearly 60% of the company’s retail sales in the past year.

Fruit, candy, dessert and other flavored e-cigarettes have been targeted because of their appeal to underage users.