NIEHS Asthma Prevention: Cigarette Smoke
- People with allergies may be more sensitive to cigarette smoke than others and research indicates that smoking aggravates allergies.
- http://www.niehs.nih.gov/airborne/prevent/smoke.html

Smoking and Respiratory Disease
- ASH-UK Factsheet on smoking and lung cancer, COPD, pneumonia.
- http://www.ash.org.uk/html/factsheets/html/fact05.html

Specimen 156.9: Lung: Emphysema
- From a library of medical images, a lung with emphysema ("smoker's lung").
- http://www.med.unsw.edu.au/pathology/Pathmus/F0839044.htm