SAN RAFAEL, CA - JANUARY 28:  Rhiannon Griffith-Bowman smokes an E-Cigarette at Digital Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products.  (Photo by Justin Sullivan/Getty Images)
What are people vaping?
An outbreak of lung disease among vapers has sparked concerns and questions about e-cigarettes. CNN's Dr. Sanjay Gupta explains what vapers are really inhaling.
02:07 - Source: CNN
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SAN RAFAEL, CA - JANUARY 28:  Rhiannon Griffith-Bowman smokes an E-Cigarette at Digital Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products.  (Photo by Justin Sullivan/Getty Images)
What are people vaping?
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