When I first heard about e-cigs I read this wiki page, i know it's a wiki but there usually accurate.
http://en.wikipedia.org/wiki/Propylene_glycol
Read what PG is used in yea it's used in anti-freeze but also pretty much everything else we use on a daily basis, it even has MEDICINE in the list.
"propylene glycol was classified by the U. S. Food and Drug Administration as "generally recognized as safe" (GRAS) for use as a direct food additive"
How is that no research? There looks to be plenty.
Who gave that lady her Degree if i can learn more from reading wikipedia. The ignorance of some so called scientific people does my head in.