This information comes from Asthma Society of Canada
“Doctors define asthma as a “chronic inflammatory disease of the airways” . It is one of the most prevalent chronic conditions affecting Canadians. Asthma can be diagnosed at any age, but often starts in childhood. Its prevalence in Canada has been increasing over the last 20 years and it is estimated that currently over 3 million Canadians have asthma.
“The three strongest risk factors for developing asthma are family history, exposure in infancy to high levels of antigens such as house dust mites, and exposure to tobacco smoke and/or chemical irritants.
“We’re all pretty familiar with allergic triggers of asthmatic symptoms, such as mould, animal dander, pollen, dust mites, etc., but perhaps less familiar with non-allergic triggers such as certain drugs, chemicals, fumes and odours, respiratory viral infections, certain weather conditions, strenuous physical exercise, tobacco smoke, and air pollution.
“Urbanization appears to be correlated with an increase in asthma. The nature of the risk is unclear because studies have not taken into account indoor...
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