3 months after quitting smokingThe lungs catch up

By Yevhenii, who smoked for 26 years · Updated 30 Oct 2026 · 2 min read

In shortBy three months circulation and lung function are improving, and the surplus nicotine receptors in the brain have come down to the level of never-smokers. Weight gain slows and cravings are occasional. Reread your if-then lines from day 29.

What's happening in your body

The NHS places better circulation between two and twelve weeks, and the American timelines drawn from the Surgeon General's 1990 report add improving lung function over the same stretch.

In the Lung Health Study, which followed thousands of smokers with early airway damage for five years, those who stopped gained a measurable amount in the air they could force out in one second during their first year, while those who kept smoking lost it. After that, the yearly decline in people who stayed stopped was half as fast as in continuing smokers, close to that of people who never smoked.

In the brain, the surplus nicotine receptors have by now come down to the level of never-smokers.

What to expect

Weight gain, if there was any, slows from here. In the trials most of it came in the first three months, and the rest arrived more gradually over the rest of the year. Mood is worth noticing too. In pooled follow-up studies, people who had stopped showed less anxiety, less depression and less stress than people who kept smoking. Cravings are now occasional and tied to situations, and a strong one can still take you by surprise. It passes the way the others did.

Try this

Read your if-then lines from day twenty-nine and add any situation the last two months have taught you about.

What else you could do

Then repeat the stairs from days fourteen and twenty-four and compare. If weight is bothering you, now that the cravings are quieter is a reasonable time to start on it gently, with more movement and regular meals rather than a strict diet. And look at the money figure. Three months of it is usually enough for something real.

Sources. NHS Better Health, Quit smoking. US Department of Health and Human Services, 1990. Scanlon PD, Connett JE, Waller LA, et al. Smoking cessation and lung function in mild-to-moderate chronic obstructive pulmonary disease: the Lung Health Study. Am J Respir Crit Care Med, 2000. Cosgrove et al., 2009. Taylor et al., 2014. Aubin et al., 2012.