Walmart said on Friday that it would stop selling e-cigarettes at its stores in the United States, dealing a new blow to the vaping industry as concerns mount over the health risks of the products and their soaring popularity among teenagers.

“Given the growing federal, state and local regulatory complexity and uncertainty regarding e-cigarettes, we plan to discontinue the sale of electronic nicotine delivery products,” the retailer said in a statement on Friday.

The decision by Walmart comes amid a drumbeat of new reports about the potential health risks of vaping that has made parents, doctors and government officials increasingly wary of the products, which are marketed as smoking-cessation devices.

Vaping products account for only a small portion of Walmart’s revenue, but e-cigarette shoppers tend to be younger and more loyal customers who shop regularly and often buy other items when they come to replenish their vaping supplies.