Found this in the news .
NEW YORK (Reuters Health) - Smoking may increase the risk of
developing allergies to a wide variety of materials, including metal
found in earrings and in the buttons of blue jeans, a group of Danish
researchers has found.
So-called contact allergies are reactions – such as red itchy skin
– that occur in response to touching a particular substance.
Dr. Allan Linneberg at Glostrup University Hospital in Copenhagen
found that contact allergies to nickel – which is found in earrings
and in the buttons to blue jeans – were more common among smokers.
Although allergies to nickel sometimes develop in people who wear
earrings, smokers had an increased risk of nickel allergy whether or
not they wore earrings.
http://www.reuters.com/newsArticle.jhtml?type=healthNews&storyID=2891755
ROBB