1. Genetic Factors for Smoking Boost Chronic Bronchitis Risk
Swedish study says it's first to quantify heritability of the disease

2. Study Links Snoring to Chronic Bronchitis
Reasons for the association are unknown, researchers say

3. Chronic obstructive pulmonary disease : Signs and tests  (Trust Mark: Doctor-Reviewed)
The health care provider make hear wheezing or abnormal breathing sounds when listening to the chest and lungs with a stethoscope. However, lung sounds can be normal during the exam. In severe cases, a person with COPD can seem anxious and may bre...• Reviewer: Benjamin Medoff, MD, Assistant Professor of Medicine, Harvard Medical School, Pulmonary and Critical Care Unit, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.