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“Juuling” is a new smoking craze among teenagers that utilizes a device much less detectable than a vape pen. Joining Megyn Kelly TODAY, NBC News medical correspondent Dr. John Torres says that while research is still underway, juuling is “not safe” – and could serve as a gateway to cigarette smoking. Correction: An earlier version of this story indicated that Juul makes and sells Juul hoodies. Juul does not make or sell hoodies.