The nasal passage of subjects with asthma has a decreased ability to warm and humidify inspired air.
Assanasen P, Baroody FM, Naureckas E, Solway J, Naclerio RM. The nasal passage of subjects with asthma has a decreased ability to warm and humidify inspired air. Am J Respir Crit Care Med. 2001 Nov 01; 164(9):1640-6.