Dear tsuwm: I couldn't find definition of "capnotic" The nearest I could come was "acapnia"/

Acapnia: Less than the normal level of carbon dioxide in the blood. The opposite of
hypercapnia.The origin of the word “acapnia” is curious. It comes from the Greek “a-“
meaning “without” + “kapnos” meaning “smoke” so acapnia literally means “smokeless”
referring to carbon dioxide which is a principal part of smoke.

For a guess, "capnotic" might mean short of breath from excessive smoking.