People who smoke for at least 10 years show more signs of aging in their skin. This can include wrinkles, age spots, and a dull complexion. Smoking can also lead to skin that is thin and more easily damaged, which can increase the risk of skin cancer. The harmful chemicals in cigarette smoke damage the skin's elastin and collagen, which are responsible for keeping skin smooth and elastic. Additionally, smoking constricts blood vessels in the skin, reducing the delivery of oxygen and nutrients that are essential for healthy skin. All of these factors can contribute to premature aging of the skin in people who smoke.