What happens to your body when you quit smoking
Short answer: Your heart rate starts dropping within about 20 minutes, carbon monoxide in your blood returns to normal within about 12 hours, and nicotine is mostly gone within about 3 days. Breathing and circulation improve over the following weeks, and long-term risks keep falling for years.
The timeline
- 20 minutes: heart rate and blood pressure start to drop.
- 12 hours: carbon monoxide in your blood is back to normal.
- About 3 days: nicotine is mostly out of your body. Cravings often peak around here.
- 1 week: taste and smell start coming back.
- 2 weeks to 3 months: circulation and lung function improve.
- 1 to 9 months: less coughing and shortness of breath.
- 1 year: heart disease risk is about half that of a smoker.
- 5 to 15 years: stroke, lung cancer and heart disease risk keep falling toward a non-smoker's.
Why the first 3 days feel the hardest
As nicotine leaves your body, withdrawal is strongest. Knowing that each craving usually lasts only 3 to 5 minutes helps: you only need to get through the next few minutes, not the whole day.
Seeing it day by day
Lungday shows every milestone above from day one, with a progress bar and countdown to the next one. None of it is locked behind a subscription.
General information based on widely published quit-smoking timelines, not medical advice. Everyone recovers at a different pace.