How does smoking lead to wrinkles?

Smoking makes your skin look older and contributes to wrinkles. Smoking narrows the tiny blood vessels in the outermost layers of skin, which decreases blood flow. This depletes the skin of oxygen and nutrients, such as vitamin A, that are important to skin health. Smoking also damages collagen and elastin — fibers that give your skin its strength and elasticity. In addition, the repetitive 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.

The distinctive characteristics of a smoker’s face which tend to make people look older than they are were called "smoker’s face" and were present in roughly half of the smokers he surveyed, irrespective of the patient’s age, social class, exposure to sunlight, recent change in weight and estimated lifetime consumption of cigarettes.

Cigarette smoke contains more than 4000 toxins many of which are absorbed directly into the bloodstream and are taken by the blood right into the structure of your skin.

Smoking cigarettes reduces the efficiency with which the skin can regenerate itself – smoking causes the constriction (narrowing) of the blood vessels at the top layers of the skin which in turn reduces blood supply (to the skin). It is the reduced blood supply which causes a reduction in the availability of oxygen (which is necessary for all living cells) and the removal of waste products, dead cell fragments etc… which provide the necessary environment for regeneration.

Cigarette smoking causes the blood vessels at the top layers of the skin to constrict and so reducing the oxygen level in the blood there. This thickens the blood and reduces the levels of collagen in the skin (it is actually because of this that smoking is also associated with slow or incomplete healing of wounds).

So if you need another reason to motivate you to quit smoking, add premature wrinkles to the list. While the skin wrinkles may not be reversible, you can prevent worsening of wrinkling by quitting smoking now.