Smoking is a known risk factor for respiratory diseases like chronic bronchitis, but genes also play a significant role in its development, according to researchers in Sweden, who studied more than 40,000 Swedish twins to determine the extent to which behavior, environment and genes each play a role ion the development of chronic bronchitis.

Long-term maintenance treatment of COPD bronchoconstriction -- Data demonstrate first nebulized formoterol fumarate provides improved lung function comparable to dry powder formoterol, enhanced patient quality of life, and positive safety profile