Scotticus, I'm surprised that you haven't been bombarded with those studies as they always are all over the news, at least in Europe, which fits the TPD's agenda wonderfully.
I'm sorry that I'm not going to google
those studies now but I believe you may be able to find them in this and other forums. Many relate to experiments performed in not at all realistic lab environemnts, being that they would mean vapers prefer vaping in a way that they're constantly getting dry hits, hence breathing formaldehyde, which is released that way (which is also present in every cigarette). One of the most famous, the one I was thinking of, was conducted by a Japanese scientist a few months ago and the said scientist has connections to the WHO, an organization that's been opposing ecigs for ages. When it came out, saying e-liquids were ten times as carcinogenic as cigarettes (frankly, I still don't understand the "ten times" they referred to), it was all over the news throughout the entire day. Not just in Portugal, all over the world. There are several other studies like that or similar in intent.
I also believe if you search for Dr. Kontantinos Farsalinos and visit his site, you'll find references to some of those studies.