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"The majority of smokers come from poorer backgrounds

People who smoked either ready-made or roll-your-own cigarettes had the same levels of both groups of chemicals, even when their age, sex, body mass index, puffing behaviour (how long and how hard people puffed) and nicotine exposure were taken into account

Walmart explained that its decision was based in part on the regulatory "uncertainty regarding e-cigarettes." "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 at all Walmart and Sam's Club US locations," the company said in a statement

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