On Friday, Walmart Inc. made a big internal announcement. According to Reuters, Walmart sent an internal memo to its staff saying that the discount retailer will discontinue the sale of e-cigarettes at it's U.S. stores. They will also discontinue the sale of electronic nicotine delivery products. What's the reason behind the decision? The retailer said that growing federal, state and local regulations around e-cigarettes and electronic nicotine delivery products are at the root of the cause.