But Juul is confronting challenges that include warnings from national regulators, investigations by members of Congress, state- and country-wide bans, and questions about its products' long-term health impacts.

A trove of images collected by Stanford researchers suggested that the campaign focused on a young audience.

The Pritzkers also founded and expanded the Hyatt Hotels chain.

National news outlets including National Public Radio, USA Today, and Business Insider reported that the Juul had a loyal and growing following among young people.

April 2018: Led by Commissioner Scott Gottlieb, the US Food and Drug Administration starts an 'undercover blitz' to crack down on sales of the Juul to minors.

In what the FDA said was the largest coordinated enforcement effort in agency history, the FDA issued more than 1,300 warning letters and fines to retailers who it said were illegally selling Juuls and other e-cigarettes to minors.

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