Federal officials are seizing more shipments of unauthorized electronic cigarettes at U.S. ports, but thousands of new flavored products continue pouring into the country from China, according to government and industry data reviewed by The Associated Press.

The figures underscore the chaotic state of the nation’s $7 billion vaping market and raise questions about how the U.S. government can stop the flow of fruit-flavored disposable e-cigarettes used by 1 in 10 American teens and adolescents.

More than 11,500 unique vaping products are being sold in U.S. stores, up 27% from 9,000 products in June, according to tightly held industry data from analytics firm Circana.