New to this group, recently diagnosed with MAC, haven't started treatment yet. I am healthy, active, good immune system, never sick, take no meds. Thinking about something a few days ago. Evidently this bacteria thrives in warm moist air. For the last 25 years I have slept with a CPAP, exclusively inhaling warm moist air for 8-9 hours daily. I have now turned off the heat and humidifier and will discuss with the pulmonologist next week. Not suggesting the bacteria homesteaded because of the CPAP, but question the continued use of the humidifier now that MAC is diagnosed. Any CPAP users here that have thought about this and/or have received guidance from their doctors?