WASHINGTON (AP) - The nation's top health authorities agree: Teen vaping is now an epidemic that now affects some 3.6 million users of Juul and other e-cigarettes. But no one knows the best way to help teenagers who may be addicted to nicotine.

E-cigarettes are now the top high-risk substance used by teenagers, according to the latest U.S. figures, which show that Juul and similar products have quickly outpaced cigarettes, alcohol, marijuana and other substances that have been tracked over more than four decades.

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