In previous discussions relating to the matter I've seen a lot of talk about oil extracts, particularly the possibility that they are contaminated. Sketchy stuff like butane or worse being used, pesticide concerns, etc. Black-market cartridges and similar products.<p>Where that the problem, I wouldn't personally be concerned. However I developed pneumonia-like symptoms after vaporizing a great deal of ground cannabis flower, sold in Washington and marketed as organic. I suspect that the product I was consuming wasn't contaminated, and it was the 'unextracted' but nevertheless vaporized oils themselves which are responsible. My symptoms have been gradually but noticably subsiding ever since I quit a few weeks ago.