Lung are made of airways, blood vessels, air sacs, ; support tissue.
Airways are made of muscle tissue. Sometimes, that muscle can tighten up like a cramp - that's called spasm. Bronchospasm
is seen when someone has a "reaction" to perfumes, allergies
, strong odors etc. When someone does not have the "classic" criteria for asthma
, but still highly suspect for it, it's called bronchospastic pulm dz.