Bronchiolitis Obliterans Caused By Exposure To Toxic Chemicals. Bronchiolitis Obliterans is a serious respiratory disease where the smallest airways of the lungs, called the bronchioles, become inflamed and damaged. Bronchiolitis obliterans can be caused by a respiratory infection after an organ transplant, but the lung disease is … [Read more...] about What Do I Need to Know About Bronchiolitis Obliterans?