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.”