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"First, it only takes 4 feet of space behind the checkout, so it was relatively easy to find space," he said

Fill bowls with vinegar and place them in the affected areas

The study is being touted as proof that e-cigarettes are a gateway to smoking, but it's possible that the six vapers who started smoking would have done so in any case

RELATED: Noxious chemical fumes': Study links toxic fumes to vaping-related lung injuries as cases increase The Associated Press contributed to this report.

Talking about the illicit trade of banned products, she said some percentage of smuggled cigarettes and e-cigarettes and other vaping devices are escaping the net of the law enforcement agencies and are finding their way to the grey market