I'm pretty curious about this as well.  I have my doubts, since you would have to get the extract's particulates super small, make sure it isn't gummy, and suspend it in something that vapes.  I think it would mainly be work that you would need a lab for.
Incidentally, someone on another forum mentioned he tried using an orange flavoring (for food) to make 
eliquid and ended up getting a mouthful of citric acid, which he obviously didn't like too much (meaning it burned the .... out of him).  Trial and error I suppose, no pain no gain.