The British Association of Dermatologists released new research that indicates smoking is a major contributing factor for adult acne if you are already predisposed to it.  In a study of 1,000 women aged 25 to 50, 42 percent of the smokers had acne, compared to only 10 percent of non-smokers.  “Dermatologists have long associated smoking with premature ageing of the skin, wrinkles and a leathery complexion,” said Dr. Colin Holden, president of the British Association of Dermatologists. “However, scientists are now increasingly linking the habit with acne.”

People of all races and ages get acne. It is most common in adolescents and young adults. An estimated 80 percent of all people between the ages of 11 and 30 have acne outbreaks at some point. For most people, acne tends to go away by the time they reach their thirties; however, some people in their forties and fifties continue to have this skin problem.

Source: NIAMS Questions and Answers About Acne

The exact cause of acne is unknown, but doctors believe it results from several related factors. One important factor is an increase in hormones called androgens (male sex hormones). These increase in both boys and girls during puberty and cause the sebaceous glands to enlarge and make more sebum. Hormonal changes related to pregnancy or starting or stopping birth control pills can also cause acne.

Another factor is heredity or genetics. Researchers believe that the tendency to develop acne can be inherited from parents. For example, studies have shown that many school-age boys with acne have a family history of the disorder. Certain drugs, including androgens and lithium, are known to cause acne. Greasy cosmetics may alter the cells of the follicles and make them stick together, producing a plug.

Source: NIAMS Questions and Answers About Acne