Body Atlas

Healthy Heart Habits · Heart

Why is smoking bad for the heart?

Smoke damages vessels, thickens blood, and steals oxygen from the heart muscle.

The simple answer

Smoking harms your heart three ways at once: chemicals in smoke damage the lining of your blood vessels, make your blood more likely to clot, and carbon monoxide takes the place of some of your oxygen — so your heart gets less of what it needs while working harder.

Go deeper

There's more: smoke damages vessels, thickens blood, and steals oxygen from the heart muscle. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

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