WASHINGTON (AP) — The Food and Drug Administration said it has sent warning letters to dozens of retailers selling fruit- and candy-flavored disposable e-cigarettes, including the current best-selling brand, Elf Bar.

It’s the latest attempt by regulators to crack down on illegal disposable vapes that have poured into U.S. stores in recent years.

Last month, the FDA issued orders allowing customs officials to seize shipments of Elf Bar, Esco Bar and two other brands at U.S. ports. None of the products have received FDA authorization and they come in flavors like cotton candy, which regulators say can appeal to teenagers.

In the latest action, the FDA said it issued warnings to 189 convenience stores, vape shops and other retailers.

Sales of disposable e-cigarettes have more than doubled in just three years, according to the CDC.

The FDA and CDC also cited Elf Bar in a separate report about thousands of calls to U.S. poison centers concerning e-cigarettes, mainly involving children under age 5.

When accidentally ingested, liquid nicotine can cause seizures, convulsions, vomiting and brain injury. 

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