Causes damage to the alveoli and increases the production of mucus in the mouth, throat, and lungs.

The correct answer is Tar.

Explanation:

Tar is the most toxic substance in tobacco smoke and is responsible for most of the diseases caused by smoking. This substance present in tobacco produces an irritating action on the respiratory tract.

This irritation leads to an increased production of

and a difficulty in eliminating it.

The secretion obstructs the airways, making it difficult for air to pass through. This results in chronic obstruction of the lung with rupture of the pulmonary alveoli.

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