Oh I see.
Okay, so I'd reword it to say something like, "While previous research has addressed the components of nicotine liquid and vapor of electronic cigarettes, studies of the 2nd hand (exhaled) vapor are still lacking. The purpose of our study was to analyze the components of 2nd hand vapor compared to cigarette smoke in order to assess the relative harm of exhaled vapor.".
That's not great ^, but I have a 5 year old showing me an ant on a boat right now, so I can't really concentrate very well. LOL. As it stands right now, it makes it sound like *your* results showed a lack of evidence that it's safe, and I had to read further to clarify what you really meant. I know it's not the real report, but lots of people will be looking at this preliminary page, and you don't want them to be confused right from the start.
Good job. Can't wait to see the final report!