While this is true, there is a much greater side effect to your skin from smoking. Smoking results in a decrease in oxygen in the blood which thereby causes vasoconstriction (narrowing) of the blood vessels that supply blood to the skin. This reduction in blood flow also alters the elastic fibers in the skin and can cause a loss of collagen in the skin. Wrinkles are more common in smokers throughout their body and smoking also reduces Vitamin A in the skin which is a key ingredient in maintaining healthy, young looking skin. On average, smokers tend to look greater than 1 year older their female non-smoking counterparts. As if you needed another reason NOT to smoke!