Just a thought...take it for what its worth. I had to stop tobi one year ago because of too much chest tightness. I tried it again this june and it is going okay. Among the many variables between the two times I've used it is the fact that I am now taking it out of the fridge and inhaling it at room temp. I take it out about 30 minutes prior to treatment. So far so good. 10 days and counting. Probably not the reason but who knows.
John
John