Walmart says it will stop selling electronic cigarettes at its namesake stores and Sam’s Clubs following a string of illnesses and deaths related to vaping.

The nation’s largest retailer said today that it will complete its exit from e-cigarettes after selling through current inventory. It cited growing federal, state and local regulatory complexity regarding vaping products.

More than 500 people have been diagnosed with vaping-related breathing illnesses. An eight death was reported this week.