title: Decline of FEV1.
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology*; D004781:Environmental Exposure; D005541:Forced Expiratory Volume; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D012907:Smoking