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[7] While the research base on e-cigarettes is still emerging, a number of studies have found that the flavoring used in e-cigarettes and e-liquids have been linked to serious health issues, including toxic effects on lung cells, including popcorn lung, as well as inflammation effects and negative effects on the immune system

When you say it, that's very shocking but when you really think about it things add up

Lord alone knows what they will do with it in future, said Van Loggerenberg

The results compiled in this study showed that the aerosols produced by the vaporization of BHO mixtures (up to 10%, w/w) at the highest e-cigarette settings (6.4 W, 5 V) did not generate new specific contaminants