WASHINGTON: Passive smoking has been found to increase breast cancer risk in women, a latest study discovered.
The study observed nearly 80,000 women aged between 50 and 79 and 3,250 cases were identified breast cancer spreading tendencies in 10 year duration. and found breast cancer risk as it was third higher among those who registered decades of passive smoking.
Passive smoking is thought to cause 600,000 deaths every year globally. One-third of those killed are children, often exposed to smoke at home, according to the World Health Organization.
New research by the British Lung Foundation has found that over half (51%) of eight to 15 year olds have been exposed to cigarette smoke when confined in a car
The latest study by US researchers, led by Dr Juhua Luo from West Virginia University, suggests that extensive exposure to second-hand smoke poses a risk.
Among the 79,990 women aged between 50 and 79 studied, the researchers identified 3,250 cases of invasive breast cancer during 10 years of follow-up.
Smokers had a 16% increased risk of developing breast cancer after the menopause.
For ex-smokers the risk was 9% and continued for up to 20 years after an individual had stopped smoking.
The highest breast cancer risk was found among women who had smoked for over 50 years or more. But women who had never smoked but had lived or worked with smokers for prolonged times also appeared to be at increased risk for breast cancer.
For example, over 10 years’ exposure in childhood, over 20 years’ exposure as an adult at home and over 10 years’ exposure as an adult at work, increased the risk by 32%.
The same was not seen among women who had been exposed to lesser amounts.
Dr Rachel Greig of Breakthrough Breast Cancer said, “The study suggests the earlier you start smoking and the longer you continue to do so, the higher your chance of developing breast cancer.
“We know that smoking has many other health risks and is a major cause of lung cancer and heart disease, and we encourage all women not to smoke,” Greig said
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