| http://www.w3.org/ns/prov#value | - To avoid confusion between asthma and Chronic Obstructive Pulmonary Disease (a disease most prevalent amongst older adults); we limited our study population to individuals aged 18 to 45 years.Definition of smokingCurrent smoking was defined based on a positive response to the question Do you currently smoke any tobacco products such as cigarettes, cigars, or pipes?.Regional differencesEstimates
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