NEW YORK — Teen vaping, which had been skyrocketing, fell dramatically in the United States last year.
A government survey released Thursday suggests the number of high school and middle school students using electronic cigarettes fell to 2.2 million last year, from 3 million the year before.
Health officials have worried about the booming popularity of vaping products among kids and the potential impact on adult smoking rates in the future.
‘‘It certainly is a public health win,’’ said Brian King, an expert on smoking and health at the Centers for Disease Control and Prevention.
It’s the first decline CDC has reported in teen vaping since the agency began tracking it in 2011. The findings echo a recent University of Michigan survey, which detected a decline in 2016.
It’s unclear why teen vaping fell last year, and it’s too soon to know if the numbers will continue to drop.
One possibility may be a growing push to ban sale of e-cigarettes to minors, including a federal regulation that took effect in August. Another may be the influence of ad campaigns by the government and other organizations to discourage youths from smoking, the CDC said.