The number of teenagers who reported using e-cigarettes in 2024 has tumbled from a worrisome peak reached five years ago, raising hopes among public health officials for a sustained reversal in vaping trends among adolescents.

In an annual survey conducted from January through May in schools across the nation, fewer than 8 percent of high school students reported using e-cigarettes in the past month, the lowest level in a decade.

That’s far lower than the apex, in 2019, when more than 27 percent of high school students who took the survey reported that they vaped — and an estimated 500,000 fewer adolescents than last year.

The data is from the National Youth Tobacco Survey, a questionnaire filled out by thousands of middle and high school students that is administered each year by the Food and Drug Administration and the Centers for Disease Control and Prevention.

Overall, it found that just under 6 percent of middle and high school students reported vaping in the last month, down from nearly 8 percent among those surveyed last year. Use among high school students largely accounted for this year’s decline; middle school use stayed fairly steady with 3.5 percent reporting they had vaped compared to 4.6 percent the year before.

“I want to be unequivocally clear that this continued decline in e-cigarette use among our nation’s youth is a monumental public health win,” Brian King, the director of the F.D.A.’s tobacco division, said during a news briefing on Wednesday.