During my bleeding troubleshooting not long ago, I went off pulmo for a week. I felt like the mucous in my chest turned into concrete. I was wheezing and overall felt worse, and was still having streaked bloody mucous. It could very well be the culprit in many peoples bleeding. The whole question comes down to weighing the pros and cons. If you have strong bleeds all the time when on it, i'd say get off it. If you have minor bleeds/streaking/blotches, but have a huge benefit from pulmo use, i'd say stay on it.