Smoking is generally not associated as a risk factor with:
Small celI carcinorna
Respiratory bronchiolitis
Emphysema
Bronchiectasis
Respiratory Bronchiolitis is usually rare complication compared to the other conditions associated with smoking. All other conditions mentioned above are associated with smoking. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 1495; R Alagappan, Manual of Practical Medicine, 3rd Edition, Pages 720-21.