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Silicon Valley e-cigarette start-up Juul Labs is bringing its small flash drive-sized vaping device to the United Kingdom this week, aiming to reproduce its break-neck U.S. growth overseas.

Since launching in 2015 Juul has transformed the market in the United States, where it now accounts for nearly 70 percent of tracked e-cigarette sales.

Juul says it targets adult smokers, but it has faced scrutiny over the popularity of its products with teenagers. [...]