1. Common respiratory diseases
Emphysema
Pneumonia
Lung Abscess
Tuberculosis
Cancer

2. 1. Normal Air Sacs (Alveoli) 2. Alveoli Affected by Emphysema
Emphysema is a type of chronic obstructive pulmonary disease (COPD) involving damage to the air sacs (alveoli) in the lungs.
As a result, your body does not get the oxygen it needs. 
The most common cause is cigarette smoking
1. Normal Air Sacs (Alveoli) 2. Alveoli Affected by Emphysema
Emphysema

3. Emphysema
The top image denotes normal size airspaces. Compare with the bottom image with abnormally enlarged airspaces of emphysema.

4. Emphysema
Numerous large bullae apparent on the surface of the lungs in a patient dying with emphysema. Bullae are large dilated airspaces that bulge out from beneath the pleura.Emphysema is characterized by a loss of lung parenchyma by destruction of alveoli so that there is permanent dilation of airspaces.

5. This is a lobar pneumonia in which consolidation of the entire left upper lobe has occurred.
Lobar pneumonia demonstrates the distinct difference between the upper lobe and the consolidated lower lobe.
Pneumonia

6. Pneumonia
Pneumonia is an inflammation of the lung, usually caused by an infection.
Three common causes are bacteria, viruses and fungi.
You can also get pneumonia by accidentally inhaling a liquid or chemical

7. Lung Abscess
Two lung abscesses, one in the upper lobe and one in the lower lobe of this left lung. An abscess is a complication of severe pneumonia,

8. Tuberculosis
Tuberculosis (TB) is a bacterial infection caused by a germ called Mycobacterium tuberculosis

9. lung with tuberculosis
lung with tuberculosis. Scattered tan granulomas are present, mostly in the upper lung fields. 
Tuberculosis

10. Lung Cancer

11. Squamous cell carcinomas are one of the more common primary malignancies of lung and are most often seen in smokers.
Lung Cancer

12. Lung Cancer
 Cigarette smoking causes 90% lung cancers. The more cigarettes you smoke per day and the earlier you started smoking, the greater your risk of lung cancer
If quit smoking, even after smoking for many years, significantly reduce your chances of developing lung cancer

13. Lung cancer
Lung cancer may be seen on chest radiograph and computed tomography (CT scan). The diagnosis is confirmed with a biopsy through bronchoscopy.

14. Bronchoscopy

15. How to reduce risk of lung cancer
Don't smoke. If you've never smoked, don't start.
Stop smoking.
Avoid secondhand smoke