I haven't been told that, but I feel like I have a similar issue. I don't get much air through my lungs at all.. Like, even compared to other CFers... When I go to the doctor, and I do my lung function thing, he always says it looks like I shouldn't even be alive.. But the funny thing is, I am healthier than a lot of Cfers.. So my doc always compares my lung functions against my own from a long time ago, instead of comparing them to other people's .. if that makes sense. I think as long as you are getting the air that your body needs, it's okay that they are smaller.