Timeline
Lung recovery timeline visualizer
Enter smoke-free days to see which recovery milestones you've reached. Milestones summarize public-health narratives from the US Surgeon General, CDC, and NHS — use them alongside, not instead of, medical advice.
Lung recovery timeline visualizer
Enter smoke-free days and review milestone-by-milestone progress.
Milestones reached: 5 / 13
1 day
Between 24 hours and a few days after quitting, nicotine levels in your blood drop to zero. Source
2 days
Withdrawal is usually worst in the first week and peaks during the first 3 days. Irritability, restlessness and strong cravings are common now. Source
3 days
For most people, day 3 is the hardest stretch. Symptoms typically start to ease once you are past it. Source
5 days
The worst withdrawal symptoms last a few days to a couple of weeks. Cravings still come in waves, but they get shorter. Source
1 week
Withdrawal is usually worst during the first week after quitting. From here, intensity typically keeps dropping. Source
2 weeks
Between 2 and 12 weeks after quitting, your circulation improves and your lung function increases. Source
3 weeks
Cravings tend to come less often as the weeks pass. Occasional mild cravings can still show up for months. Source
1 month
The intensity of withdrawal typically drops over the first month, although some people have symptoms for several months. Source
6 weeks
It can take as little as 6 weeks to start feeling the mental health benefits of quitting, such as less anxiety and stress. Source
2 months
You are inside the 2–12 week window in which circulation improves and lung function increases. Source
3 months
Between 1 and 9 months after quitting, coughing and shortness of breath decrease. Source
6 months
Coughing and shortness of breath keep decreasing, a change that can continue up to 12 months after quitting. Source
1 year
After 1 year, your risk of coronary heart disease is about half that of someone who still smokes. Source
How to use this visualizer
- Count your smoke-free days. If you are not using the Blou app, subtract your quit date from today. Partial days count as the next whole day.
- Enter days smoke-free. Enter the number in the input field. The tool will update the milestone list in place.
- Review reached milestones. Each filled milestone shows what typically changes in your body at that point. Read the underlying CDC and Surgeon General references for more detail.
- Open guide for each milestone. For a richer explanation, open the milestone guide under /guides (e.g. 'What happens after 1 week').
Source references
- CDC: Benefits of Quitting · US Centers for Disease Control
- US Surgeon General's Report on Smoking Cessation (2020) · US HHS
- NHS: Quit smoking · UK National Health Service
Frequently asked questions
How accurate is this timeline?
The milestones on this page summarize public-health narratives from the US Surgeon General, CDC, and NHS. Individual recovery varies with age, pack-years smoked, baseline lung function, and concurrent conditions.
When does the lung cilia regrow?
Cilia (the hair-like clearers in the airways) begin recovering within 1–3 months of stopping smoking, and cough/mucus typically improves around that window — see the 1-month milestone in the timeline.
How long until lung function fully recovers?
Airway inflammation and ciliary function usually improve within 3–9 months. Structural changes from COPD are not fully reversible, but further decline slows dramatically after quitting. See the full timeline for detail.
I still have a cough after 3 weeks — is that normal?
A temporary 'quit cough' is common for the first 1–3 months as cilia recover. If your cough is productive of blood, includes fever, or worsens after week 4, see your clinician.
Blou for iPhone
See your own recovery, not an average
Guides tell you what usually happens. Blou shows what is happening to you, from your first smoke-free day.
Photo timeline
See your face change over time in one photo timeline.
Lung checks
Simple breath checks that show your lungs getting stronger.
SOS craving help
Instant help the second a craving hits.
Every milestone visualized
Watch your whole journey unfold on one visual timeline.
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