AP BIOLOGY

Detailed explanation-1: -Tar is the sticky brown substance that stains smokers’ teeth and fingers yellow-brown. It contains cancer causing particles (carcinogens). Tar damages your lungs by narrowing the small tubes (bronchioles) that absorb oxygen. It also damages the small hairs (cilia) that help protect your lungs from dirt and infection.

Detailed explanation-2: -Toxicants in tobacco smoke paralyze the cilia and eventually destroy them, removing an important protection from the respiratory system. Cigarette smoke can also trigger asthma attacks, and smokers are at increased risk of contracting pneumonia and bronchitis.

Detailed explanation-3: -What is tar? When tobacco is burned it creates a toxic smoke; tar is a part of this smoke. It is a sticky black chemical substance that can gather inside the lungs and lead to lung cancer, emphysema and other lung problems.

Detailed explanation-4: -Benzene. Carbon monoxide. Tobacco-specific nitrosamines (TSNAs)

Detailed explanation-5: -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.