Which lifestyle factor is known to negatively impact skin health?

The choice regarding smoking as a lifestyle factor negatively impacting skin health is well-supported by extensive research and clinical evidence. Smoking introduces numerous harmful substances into the body, such as nicotine and carbon monoxide, which can lead to decreased blood flow and reduced oxygen supply to the skin. This can compromise the skin's ability to repair itself and maintain a healthy appearance.

Additionally, smoking is associated with the formation of wrinkles and premature aging due to the impact on collagen and elastin production, crucial proteins that provide structure and elasticity to the skin. The toxins in cigarette smoke can also lead to a dull complexion, increase the risk of skin diseases, and exacerbate conditions like acne and psoriasis.

In contrast, the other options listed promote skin health. Regular exercise enhances circulation and helps deliver essential nutrients to skin cells, while consuming antioxidants contributes to combating oxidative stress, and proper hydration maintains skin moisture and elasticity. These factors all support optimal skin function and appearance, highlighting the detrimental role smoking plays in contrast.