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“These include allergies, nonallergic irritation of the nose, colds, and sinus inflammation and infections.”

Sedaghat notes that recent evidence suggests people who produce allergic inflammation may have a lower risk of producing the nonallergic type of inflammation associated with severe COVID.

The response is called nonallergic vasomotor rhinitis, and you’re more likely to experience it with floral fragrance if you’re also sensitive to other smells, such as perfumes, detergents or candles.

Analyzing feces of healthy babies and those with egg or milk allergies, researchers showed that allergic and nonallergic infants had different communities of gut bacteria.

Nonallergic rhinitis, meanwhile, may become more common with age — possibly because our nasal linings thin and our immune system becomes less robust.