My great grandfather died in 1924 of "frozen lungs". Any thoughts on exactly what that means? I mean, how does one literally freeze their lungs? Surely if he froze to death it'd say that instead. Does the phrase refer to something else perhaps? Some sort of respiratory disease maybe? He died in Wadena, Saskatchewan, and it's certainly cold enough to freeze to death there at the right times of year, yet the phrase sounds strange to me. Mark