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Walmart has said it will no longer sell e-cigarettes in the US, amid mounting calls to ban the products entirely. The retailer said its decision was due to "uncertainty" about the rules governing e-cigarettes, which US health authorities have linked to more than 500 cases of lung injury. On Friday a group of US senators called on health authorities to remove all pod and cartridge-based e-cigarettes from the market until it can be proven the products are safe.