I didn’t do everything right. I am not sure I even know what that means when it comes to lung health, but in any event I am sure I have been less than perfect. Nonetheless, I suspect my BE was caused by my MAC (not the other way around). I have a body type that is associated with MAC — tall, thin, mitro valve prolapse, pectus excavatum, scoliosis — and whether that creates a mechanical propensity or represents a genetic one is unclear. Just my working theory, subject to change.