A mosquito coil contains toxic fumes equivalent to those in 175 cigarettes.
The use of mosquito coils, other than smoking and air pollution, is
said to be a main contributory factor for asthma.
With more than 200,000 asthmas patients found every year, Sri Lanka is one of the countries with the highest incidence of the ailment in South Asia.
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http://www.srilankamirror.com/news/4328-mosquito-coils-increase-asthma-patients
