Day 14 after quitting smokingBlood that flows more easily

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

In shortIn one small study the extra stickiness of blood platelets had gone by day fourteen, which is one reason heart attack risk falls. You will probably not feel it. If you take prescribed medicine, keep taking it and tell your pharmacist you have stopped.

What's happening in your body

Smoking makes platelets stickier than normal. They are the cells that gather first to form a clot, and that is one of the ways tobacco raises the risk of a heart attack. The stickiness responds fast. In a small study of twenty-seven men who had smoked for years and then stopped, the extra clumping had gone by day fourteen, and it came back in those who were asked to start smoking again.

It is one small study, and platelets can be measured in more than one way, so treat the date as approximate. The NHS places the improvement in circulation separately, between two and twelve weeks.

What to expect

Some people notice warmer hands and feet. Most notice nothing, because a lower tendency to clot does not feel like anything. It is one of the most consequential changes on this timeline and one of the least visible. Around now some people also find that a hill costs a little less, which is the circulation and the airways working together. Others notice nothing yet, and that does not mean nothing is changing.

The NHS window for circulation runs to twelve weeks. If you take medicine prescribed by a doctor, keep taking it and tell them or your pharmacist that you have stopped smoking. The liver enzyme from day four handles some medicines as well as caffeine, and a dose may need checking.

Try this

Walk a route you know well, a hill or four flights of stairs, at your usual pace, and write down how you feel at the top. Day twenty-four will ask you to do it again.

What else you could do

Take your pulse too, seated, at the same time of day, and set it beside the one from twenty minutes into your first day, if you wrote it down. If your hands and feet were always cold, notice whether that changes over the coming weeks. And a brisk walk on most days helps the circulation as well as the cravings.

Sources. Morita H, Ikeda H, Haramaki N, Eguchi H, Imaizumi T. Only two-week smoking cessation improves platelet aggregability and intraplatelet redox imbalance of long-term smokers. J Am Coll Cardiol, 2005. NHS Better Health, Quit smoking. Faber MS, Fuhr U. Time response of cytochrome P450 1A2 activity on cessation of heavy smoking. Clin Pharmacol Ther, 2004.