I'm not sure Sheanna. A while back I was taking at on of different supplements, all very high dose. That was when I was having bad lung bleeds over a period of time and went on IV's, etc. I stopped drinking caffeine, and stopped all my supplements. I even went as far as to stop my pulmozyme. I was crazily trying to find the cause of my bleeds (at the time, and previous to my bad bleeds I had been off oregano oil for a while). After it became apparent a slight infection was being made worse by my high blood pressure, I got back on my old blood pressure meds, changed diet, and slowly started back on some of my supplements (oregano oil included).
Now with the exception of some very very rare streaks, i'm hemoptysis free. I bet if docs looked more into it, they would notice a huge connection between spikes in blood pressure and hemoptysis episodes.
BTW if you go and get regular oregano oil at say walmart, or even the regular stuff of the brand I use, don't inhale it. You don't want to inhale an oil into the lungs. Try the stuff under the tongue first if you want to be safe (you can use the regular stuff for this). If you don't notice any difference at all after a few weeks to a month, i'd try the brand I use. I also started to use the water soluble stuff in my neil med nasal rinses.