Tar contains most of the cancer-causing and other harmful chemicals found in tobacco smoke. When tobacco smoke is inhaled, the tar can form a sticky layer on the inside of the lungs. This damages the lungs and may lead to lung cancer, emphysema, or other lung problems.

The main cause of emphysema is long-term exposure to airborne irritants, including: Tobacco smoke.

Centriacinar emphysema is characterized by focal destruction limited to the respiratory bronchioles and the central portions of the acini. This form of emphysema is associated with cigarette smoking and is typically most severe in the upper lobes.

Smoking is the leading cause of chronic obstructive pulmonary disease (COPD). Smoking is also a trigger for COPD flare-ups. Smoking damages the air sacs, airways, and the lining of your lungs. Injured lungs have trouble moving enough air in and out, so it’s hard to breathe.

Not only can it cause lung inflammation, but smoking also destroys the tiny air sacs in the lungs, called alveoli. Smoking’s a major risk factor for lung cancer, too. Once this damage is done, it can’t be reversed. By continuing to smoke, you’ll increase your risk of developing COPD.

Emphysema and COPD can’t be cured, but treatments can help relieve symptoms and slow the progression of the disease.

Ways to clear the lungs

1. Steam therapy. Steam therapy, or steam inhalation, involves inhaling water vapor to open the airways and help the lungs drain mucus.
2. Controlled coughing.
3. Drain mucus from the lungs.
4. Exercise.
5. Green tea.
6. Anti-inflammatory foods.
7. Chest percussion.