Dr Noah Greenspan has just published an excellent online book called "Ultimate Pulmonary Wellness". Only had a chance to have a quick look at it so far but, from what I've seen, it looks like an amazing resource and should be a great source of information for anyone with breathing problems - and its free!!. Can be found at :-
Dr Greenspan deserves a huge thank you for taking the time to produce this book and all of the excellent webinars he has put together - see