NEW YORK (CBSDFW.COM/AP) — Two major retailers say they will no longer sell e-cigarettes in the U.S. amid mounting health questions surrounding vaping.

Supermarket chain Kroger and drugstore chain Walgreens announced Monday they would discontinue sales of e-cigarettes at their stores nationwide, citing an uncertain regulatory environment.

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The vaping industry has come under scrutiny after hundreds of people have fallen ill and at least eight have died after using vaping devices.

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Walmart announced last month that it would stop selling e-cigarettes at its stores nationwide.

Kroger said it would stop selling e-cigarettes as soon at its current inventory runs out at its more than 2,700 stores and 1,500 fuel centers. The Cincinnati-based company operates the Ralphs, Harris Teeter and other stores.

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Walgreens, based in Deerfield, Illinois, operates more than 9,500 stores in the U.S.