(NaturalNews) The level of nicotine in a woman's toenails is a highly accurate predictor of her heart disease risk, according to a study conducted by researchers from the University of California-San Diego and published in the
American Journal of Epidemiology.
"The use of toenail nicotine is a novel way to objectively measure exposure to tobacco smoke and could become a useful test to identify high-risk individuals in the future," lead researcher Wael Al-Delaimy said.
Al-Delaimy noted that while it is well-known that
smoking is a major risk factor for cardiovascular disease, including
heart attack and stroke, physicians cannot always obtain accurate data about a patient's smoking history simply by asking. Other tests of
nicotine body burden, such as saliva or urine
tests, only indicate recent
exposure to cigarette smoke. But because toenails grow at an average rate of only 1 centimeter per year, their nicotine concentration gives a more accurate picture of long-term exposure - including second-hand smoke.
The researchers examined toenail clippings from 62,500 nurses, and found that those who had
heart disease had, on average, twice as much nicotine in their toenails as healthy
women. Even after adjusting for other potential influences, women with the highest nicotine content in their toenails had four times the
heart disease risk of those with the lowest nicotine content.
Women with high nicotine concentrations were more likely to have high blood pressure, diabetes, to drink heavily, to have a family history of smoking and to be thinner than those with less nicotine were.
The researchers noted that it is not nicotine itself that causes heart
disease, but that nicotine merely functions as a measure of overall
tobacco exposure.
"People using nicotine replacement therapy should not be alarmed by this study," said Ellen Mason of the British Heart Foundation, "as it is the other chemicals inhaled when smoking, such as carbon monoxide that cause the
risk of heart disease, not nicotine."
"Men and women who smoke are around twice as likely to suffer a heart attack in their life time as those who don't," Mason said, "and quitting smoking is one of the most effective ways to reduce this risk."
Sources for this story include: news.bbc.co.uk.
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