What can excessive smoking lead to in terms of skin health?

Excessive smoking can lead to sallow skin, which is characterized by a yellow or unhealthy pallor. This is primarily due to the harmful effects of the toxins in cigarette smoke that can damage skin cells and reduce blood flow to the skin. The chemicals in tobacco can also lead to the breakdown of collagen and elastin, essential proteins that maintain skin's firmness and elasticity. As a result, the overall appearance of the skin can become dull, lacking the vibrant and healthy tone associated with good skin health. Thus, sallow skin is a common visual indicator of the damaging effects of smoking on the skin's appearance.