theres so many mould sources that could have caused your reaction, and PM is so ubiquitous i doubt the PM was the cause. Of all the fungal health warnings we've been issued, PM has never been warned against in agriculture. Even as common as it is, PM has never been reported, nor had any warnings issued about it's safety. Ive never heard of powdery mildew having adverse effects on human health. In truth there are millions of types of fungus out there, and only a few are dangerous to your health even in large doses. Powdery Mildew is not one of those few dangerous ones.
http://www.thoracic.org/education/breathing-in-america/resources/chapter-9-fungal-lung-disease.pdf
cryptococcus,, aspergillus histoplasmosis etc.. but no powdery mildew, despite exposure being almost universal in agriculture, and very high in pot users. many people these days like to be cassandra and prophesy disaster at every turn, but if nobody has ever been diagnosed with powdery mildew in the lungs, you can be fairly confident that your dope can be washed before drying and smoked safely. the only remarks about health propblems from PM come from nervous pot-heads, not scientists, doctors or health professionals.
Jorge Cervantes and the medical field are with me on this one. im not suggesting that PM is a health tonic, nor should you roll up a powdery mildew doobie, but if treated with a thorough washing with H2O2 (like Jorge has done many times) and a proper drying in low humidity, dope with a PM infestation washed away can be safely smoked by anyone who is not an end stage aids patient or suffering from terminal emphysema. You may be smoking PM in your bong right now, and never know it.
You must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. You will face your fear. You will permit it to pass over you and through you. And when it has gone past you will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only you will remain.