A new federal bill signed into law this past Friday prohibits the sale of tobacco and vaping products to anyone under the age of 21 in the United States.

The announcement came amid continued concerns about rising levels of youth vaping and a mysterious outbreak of vaping-related lung injuries.

Health organizations have pressured the administration to ban flavors, which are popular among young people. Vaping advocates have argued they’re a tool for adult smokers to quit combustible cigarettes. Vape shop owners have argued that limits on sales of flavors would destroy their businesses.

The latest report from a federal survey, called Monitoring the Future, found that 1 in 4 12th graders, 1 in 5 10th graders and nearly 1 in 10 8th graders say that they have vaped nicotine in the past month.