- Thestrongestriskfactorsfordevelopingasthmaareinhaledsubstancesandparticlesthatmayprovokeallergicreactionsorirritatetheairways.Particlepollution-suchassmoke,dustandheavymetals--isknowntoirritatetheairwaysandworsenasthma,andseveralstudieshavelinkeditto...
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