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DermNet NZ


Facts about the skin from DermNet New Zealand Trust. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Smoking and its effects on the skin

Beyond its known links to cancer, lung and heart disease, smoking is now thought to be associated with premature skin ageing and delayed wound healing, as well as a number of skin disorders, particularly psoriasis, hidradenitis suppurativa and cutaneous lupus erythematosus.

Smoking and ageing skin

Smoking can accelerate the skin ageing process in the skin. Ageing of the skin means that it droops, develops wrinkles and lines and can become dry and coarse with uneven skin colouring and broken blood vessels (telangiectasia). Smokers can appear gaunt and develop an orange or grey complexion.

Since the 1970's studies have shown that smoking results in more premature facial wrinkling than sun exposure. Lines around the eyes called “crow's feet” can develop at an earlier age. Multiple vertical lines around the mouth also occur and are called “smoker's lines”. These effects continue into old age. By the age of 70 years, smoking 30 cigarettes a day could lead to the equivalent of an extra 14 years of skin ageing.

Smoking and its effects on the skin Smoking and its effects on the skin Smoking and its effects on the skin
Smoker's lines

How does smoking cause ageing of the skin?

It is not certain exactly how smoking causes early ageing of the facial skin. Theories include:

Smoking and wound healing

Smoking delays wound healing, including skin injuries and surgical wounds. It increases the risk of wound infection, graft or flap failure, death of tissue and blood clot formation. The reasons for this are unclear but involve:

Smoking contributes to the development and persistence of leg ulcers, particularly arterial ulcers and diabetic foot ulcers.

Smoking and its effects on the skin
Venous ulcer
Smoking and its effects on the skin
Diabetic foot ulcer
Smoking and its effects on the skin
Failing skin graft
Slow healing wounds in smokers

Smoking and viral infections

Smoking is associated with a greater likelihood or severity of certain viral infections, including genital warts. If you have genital warts and you smoke, you have a greater chance of developing wart-virus associated cancers, including cervical cancer, vulval intraepitheial cancer, vulval cancer or penile intraepitheial cancer.

Smoking and skin cancer

If you smoke cigarettes, compared to non-smokers you have twice the risk of developing a type of skin cancer called squamous cell carcinoma. There is also an increased risk of oral leukoplakia (precancer) and oral cancer; 75% of cases of oral cancer occur in smokers.

Smoking and skin cancer
Lip cancer (squamous cell carcinoma)
Smoking and skin cancer
Oral leukoplakia
Smoking and skin cancer
Ear cancer (squamous cell carcinoma)
Smoking and skin cancer

Smoking and psoriasis

Studies have shown that if you smoke you have a higher risk of a scaly skin condition called psoriasis. Psoriasis tends to be more extensive and severe in smokers, particularly if they also have metabolic syndrome. A form of localised psoriasis known as palmoplantar pustulosis (also called palmoplantar pustular psoriasis) is much more common in smokers than in non-smokers. This condition presents with multiple yellow or brown painful pus-containing lesions on the palms and soles.

Psoriasis is an immune-mediated condition. Smoking is thought to increase the risk of developing psoriasis by affecting the immune system. The nicotine in cigarettes binds to immune cells called dendritic cells and T-cells and may change their function to promote proliferation of skin cells (keratinocytes). Nicotine also binds to keratinocytes directly and helps them divide faster and move upward towards the skin surface.

Smoking and psoriasis
Chronic plaque psoriasis
Smoking and psoriasis
Scalp psoriasis
Smoking and psoriasis
Localised pustular psoriasis
Psoriasis

Hidradenitis suppurativa

Hidradenitis suppurativa, also called acne inversa, occurs more frequently in smokers. In this condition abscesses develop in the armpits, under the breasts and in the groin. Like ordinary acne, the hair follicles become blocked, then become inflamed and form abscesses. The nicotine in cigarettes increases the production of a chemical called acetylcholine around the hair follicle, which promotes overgrowth of the upper portion of the hair follicle and thus causes a blockage.

Smoking and hidradenitis suppurativa Smoking and hidradenitis suppurativa Smoking and hidradenitis suppurativa
Hidradenitis suppurativa (acne inversa)

Vascular disease

Blood vessels narrow temporarily and eventually permanently on exposure to nicotine, and smoking makes blood clots more likely to develop.

Smoking can aggravate or initiate Raynaud phenomenon. In this condition the arteries supplying the fingers and toes may go into spasm, causing temporary cessation of blood flow. The skin turns through a succession of colours from normal to white, blue and finally red as it rewarms. Usually cold temperature triggers an episode, but nicotine and caffeine are also known culprits.

Secondary Raynaud phenomenon is when there is an associated disorder causing blood vessel spasm or obstruction. Raynaud phenomenon is sometimes a sign of systemic sclerosis, which is an autoimmune disorder, in which the body's immune system attacks itself, resulting in widespread scarring (fibrosis) and vascular disease. Raynaud phenomenon is one of its first symptoms and can lead to ulcers on the fingertips and toes where the blood supply is poor. Smoking, which is a significant risk factor for vascular disease, increases the risk of developing these ulcers.

Chilblains are also due to vasoconstriction and may be aggravated by smoking, as may frostbite.

Smoking is also responsible for Buerger disease (thromboangiitis obliterans), in which blood clots occur in small blood vessels, and many cases of cholesterol emboli associated with atherosclerosis. It may aggravate the tendency to clot caused by thrombophilia, antiphospholipid syndrome or drugs. Thus those prescribed oral contraceptive medication, perhaps as hormonal therapy for acne, are advised not to smoke.

Smoking and its Raynaud phenomenon
Raynaud phenomenon
Smoking and chilblains
Chilblains
Smoking and antiphospholipid syndrome
Antiphospholipid syndrome
Vascular effects of smoking

Cutaneous lupus erythematosus

In the last few years studies have shown a more than ten fold increased risk of discoid lupus erythematosus in smokers. In this autoimmune skin condition, light exposed areas such as the face develop scaly red lesions that can leave scars. One theory that explains how smoking could increase the risk of discoid lupus is that it increases autoimmune activity by activating the lymphocytes (white blood cells) called B-cells and T-cells.

Treatment of cutaneous lupus erythematosus with hydroxychloroquine and other medications is less effective in smokers.

Smoking and discoid lupus erythematosus Smoking and discoid lupus erythematosus Smoking and discoid lupus erythematosus
Discoid lupus erythematosus: severe in smokers

Oral diseases

Not surprisingly, conditions affecting the mouth tend to be more common in smokers. These include:

Rather surprisingly, aphthous ulcers are less common in smokers.

Smoking and oral candidiasis
Oral candidiasis
Smoking and cheilitis
Cheilitis
Smoking and black hairy tongue
Black hairy tongue
Oral disease: worse in smokers

Other skin diseases

There is a general observation that smokers tend to be more severely affected by many skin diseases than non-smokers and various conditions appear more difficult to treat effectively in smokers.

Effect of smoking on medicines

Polycyclic aromatic hydrocarbons from smoking induces CYP1A2 enzymes in the liver. These enzymes destroy toxins. The result is that smokers need higher doses of many medicines compared to non-smokers to achieve the same result. These include insulin, pain relievers, antipsychotics, anticoagulants, caffeine and alcohol.

Alcohol intake and caffeine intake are on average double in smokers. This tolerance of alcohol and caffeine is quickly lost when a smoker stops smoking. Previously tolerated amounts of alcohol and caffeine can result in unexpected toxicity.

Alcohol ingestion can also lead to smoking more.

How can I get help to stop smoking?

If you want to stop smoking or are thinking about quitting, there are people and services who can help.

A combination of approaches is often best. A meter to measure carbon monoxide in breath can be used to guide treatment.

Related information

References:

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Author: Dr Susan Simpkin, Medical Registrar, Waikato Hospital, Hamilton, New Zealand.

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If you have any concerns with your skin or its treatment, see a dermatologist for advice.