The categories are: Environmental irritants Conditions within the lungs Conditions along the passages that transmit air from the lungs to the environment Conditions within the chest cavity but outside of the lungs Digestive causes
Cigarette filters have a lot of very small air holes that smoke comes through them into the smoker mouth and during the smoking process the bottom of the filter will be dark brown
London: RCP, 2002
Eur Respir J 39(2):385391 Suzuki M, Betsuyaku T, Ito Y, Nagai K, Odajima N, Moriyama C, Nasuhara Y, Nishimura M (2009) Curcumin attenuates elastase- and cigarette smoke-induced pulmonary emphysema in mice
Fitted with an anatomically shaped cork footbed, the Boston is designed to mold to the wearers foot over time, providing custom-tailored support with continued wear
"Birch tar production does not prove Neanderthal behavioral complexity"