Body Atlas

Healthy Lung Habits · Lungs

What does smoking actually do to the lungs?

It stalls the cleaning crew and destroys exchange surface.

The simple answer

Smoke attacks the lungs at every level you've just learned. It paralyses the cilia that sweep your airways clean, inflames and narrows the tubes, and breaks down the walls between alveoli — merging many small sacs into fewer large ones.

Go deeper

There's more: it stalls the cleaning crew and destroys exchange surface. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

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