How does smoking lead to wrinkles? The nicotine in cigarettes causes narrowing of the blood vessels in the outermost layers of your skin. This impairs blood flow to your skin. With less blood flow, your skin doesn't get as much oxygen and important nutrients, such as vitamin A.
Many of the more than 4,000 chemicals in tobacco smoke also damage collagen and elastin, which are fibers that give your skin its strength and elasticity. As a result, skin begins to sag and wrinkle prematurely because of smoking.
In addition, repeated exposure to the heat from burning cigarettes and the facial expressions you make when smoking — such as pursing your lips when inhaling and squinting your eyes to keep out smoke — may contribute to wrinkles. Premature wrinkling was first documented in smokers in the early 1970s, in the Annals of Internal Medicine. In a study of more than 1,100 subjects, University of California researcher Harry W. Daniell noted that the severity of wrinkling—after accounting for factors like age and sun exposure—was most apparent in smokers of both sexes beginning around the age of 30. Smokers between the ages of 40 and 49, reported Daniell, were as likely to be “prominently” wrinkled as non-smokers who were 20 years older.
|Pix from WebMD|
In the picture above you can clearly see the effect smoking had on Twin B.