Sorry, didn't realize, I was reading the study from NBCNEWS at http://www.nbcnews.com/health/cancer/you-vape-high-levels-formaldehyde-hidden-e-cigs-n290826
This is a study that was published in the New England Journal of Medicine done on the safety of e-cigs or better known as vaping.
The article states, "They found that vaping 3 milligrams of e-cigarette liquid at a high voltage can generate 14 milligrams of loosely affiliated or "hidden"...