@tdrell and @jkiemen, If you Google Nitrous Oxide/mycobacterium/NIH.gov you can find info on this subject. I posted the link awhile ago, but will have to look for it again. NIH (National Institute of Health) did studies many years ago on treating mac with nitrous oxide. The study proved it does kill off mac, but the delivery system was not cost effective to use it at that time. One would have to spend four hours a day in a medical facility to receive the treatment. I forgot for how many days one would need to do that. Bottom line was, there was no money to be made. It will be interesting to see how an inhaled version of this will go. For as bad as our disease is, it sure is interesting to me to research it.