About 1 in 8 US high school students — more than 2 million total — said they had used tobacco products in the previous 30 days, the vast majority being e-cigarettes, according to results from the 2021 National Youth Tobacco Survey.

For middle-schoolers, that number was 1 in 25 or 470,000 total.

On one hand, these numbers appear to continue a decline seen from 2019 to 2020, especially when it comes to vaping. However, the authors of the latest report caution against comparing 2021 to prior years because the data was collected differently during the pandemic to include students learning remotely. Experts say it’s unclear how much teen tobacco use may have been affected by access and remote learning during that time.

Public health advocates say that curbing youth use is a high priority when it comes to tackling the leading cause of preventable disease and death in the United States, given that the majority of smokers started before age 18.

Some of the survey’s findings on e-cigarettes were released last year, detailing the popularity of flavored products and disposable vapes. The latest analysis, a collaboration between the US Centers for Disease Control and Prevention and the US Food and Drug Administration, includes a wider range of data on other tobacco products, demographics, and other factors associated with their use.

Among the findings: About 11% of high schoolers reported vaping in the past 30 days. For cigarettes, this was just under 2% — a number Matthew L. Myers, president of the Campaign for Tobacco-Free Kids, described in a statement Thursday as “historically low.”

“While these results may be impacted by the pandemic and changes in how the survey was conducted, the low youth smoking rates also continue a remarkable long-term trend,” said Myers, who was not involved in the report.

These numbers were also higher among students experiencing severe psychological distress: 14.2% versus 5.5% among those reporting no distress. The authors of the latest report say it works both ways: “Studies found that youths with mental health disorders were at increased risk for cigarette smoking, but also that youth nicotine exposure was associated with the development of mental health disorders.”

Overall past-30-day use was highest among non-Hispanic White students, but the use of combustible tobacco in particular, such as cigarettes and cigars, was more prevalent among non-Hispanic Black students.

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