What’s really inside vaping cartridges?

At least 12 people have died from vaping-related illnesses, according to the CDC, and more than 800 cases of such illnesses have been reported in 46 states. What in e-cigarettes is making people so sick? NBC’s Cynthia McFadden reveals shocking discoveries that may shed light on the mystery. Plus, NBC medical correspondent Dr. John Torres joins TODAY to weigh in.

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