Allergens and irritants.
The range of diseases caused by respiratory allergens and irritants is wide because they trigger different pathophysiological mechanisms. Surprisingly, though smoking promotes asthma it exerts the opposite effect on the development of extrinsic allergic alveolitis.
Taylor
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D000393:Air Pollutants / Q000009:adverse effects*; D000542:Alveolitis, Extrinsic Allergic / Q000209:etiology* / Q000276:immunology; D000818:Animals; D001249:Asthma / Q000209:etiology* / Q000276:immunology; D001716:Bird Fancier's Lung / Q000209:etiology; D006801:Humans; D014028:Tobacco Smoke Pollution / Q000009:adverse effects
D000393:Air Pollutants; D014028:Tobacco Smoke Pollution