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This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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They say that the nose knows.

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But it still gets its marching orders from the brain, at least when it comes to the lungs,nose to brain to lungs.

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Got that? Good.

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Because a new study shows that when people with asthma think they're smelling something noxious, their airways become inflamed, even when the odor is harmless.

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The finding is in the Journal of Psychosomatic Research.

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Asthma attacks can be triggered by pollen, dust, harsh chemicals or scents.

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These environmental annoyances constrict the airways in the lung, making breathing difficult.

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In this study, researchers wanted to see whether an individual's assumptions have any influence over this breathtaking series of events.

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So they exposed 17 asthma sufferers to a benign chemical that smells like roses for 15 minutes.

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Nine subjects were told the fragrance was a potential irritant, the other eight that it would be therapeutic.

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The results were as plain as the nose on your face: subjects who expected an irritant experienced inflammation.

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And those who were primed to be soothed had no adverse reactions, even if they were normally bothered by perfumes.

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The results suggest that a rose by any other name would smell as sweet.

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Or be as irritating as you expect it will.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.

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