Within ...

20 minutes Your blood pressure, pulse rate and the temperature of your hands and feet have returned to normal.

8 hours Remaining nicotine in your bloodstream has fallen to 6.25% of normal peak daily levels, a 93.75% reduction.

12 hours Your blood oxygen level has increased to normal. Carbon monoxide levels have dropped to normal.

24 hours Anxieties have peaked in intensity and within two weeks should return to near pre-cessation levels.

48 hours Damaged nerve endings have started to regrow and your sense of smell and taste are beginning to return to normal. Cessation anger and irritability will have peaked.

72 hours Your entire body will test 100% nicotine-free. Over 90% of all nicotine metabolites (the chemicals nicotine breaks down into) have passed from your body via your urine. Symptoms of chemical withdrawal have peaked in intensity, including restlessness. Unless use cues have been avoided, the number of cue induced crave episodes experienced during any quitting day have peaked for the "average" ex-user. Lung bronchial tubes leading to air sacs (alveoli) are beginning to relax in recovering smokers. Breathing is becoming easier and your lung's functional abilities are improving.

5 - 8 days The "average" ex-smoker is down to experiencing just three cue induced crave episodes per day. Although we may not be "average" and although minutes may feel like hours when normal cessation time distortion combines with the body's panic response, it is unlikely that any single episode will last longer than 3 minutes. Keep a clock handy and time the episode to maintain an honest perspective on time.

10 days The "average" ex-user is down to encountering less than two crave episodes per day.

10 days to 2 weeks Recovery has likely progressed to the point where your addiction is no longer doing the talking. Blood circulation in your gums and teeth are now similar to that of a non-user.

2 to 4 weeks Cessation related anger, anxiety, difficulty concentrating, impatience, insomnia, restlessness and depression have ended. If still experiencing any of these symptoms get seen and evaluated by your physician.

2 weeks to 3 months Your heart attack risk has started to drop. Your lung function has noticeably improved. If your health permits, sample your circulation and lung improvement by walking briskly, climbing stairs or running further or faster than normal.

21 days The number of acetylcholine receptors, which were up-regulated in response to nicotine's presence in the frontal, parietal, temporal, occipital, basal ganglia, thalamus, brain stem and cerebellum regions of your brain have now substantially down-regulated. Receptor binding has returned to levels seen in the brains of non-smokers (2007 study).

3 weeks to 3 months Your circulation has substantially improved. Walking has become easier. Your chronic cough, if any, has likely disappeared. If not, get seen by a doctor, and sooner if at all concerned, as a chronic cough can be a sign of lung cancer.

4 weeks Plasma suPAR is a stable inflammatory biomarker that helps predict development of diseases ranging from diabetes to cancer in smokers. A 2016 study found that within 4 weeks of quitting smoking, with or without NRT, that suPAR levels in 48 former smokers had fallen from a baseline smoking median of 3.2 ng/ml to levels "no longer significantly different from the never smokers' values" (1.9 ng/ml)

8 weeks Insulin resistance in smokers has normalized despite average weight gain of 2.7 kg (2010 SGR, page 384).

1 to 9 months Any smoking related sinus congestion, fatigue or shortness of breath has decreased. Cilia have regrown in your trachea (windpipe) thereby increasing the ability to sweep dirt and mucus out of your lungs. Your body's overall energy has increased.

11 months Smoking decreases the thickness of the brain's outer layer, the cortex. Smoking induced cortical thinning is associated with poor decision making, risk taking, a lack of impluse control, early dementia, and nearly 14% of Alzheimer’s cases worldwide. According to a 2015 study, it takes 0.9 years (10.8 months) without smoking to recover from the cortical thinning effect of each pack-year of smoking. Congratulations, your cortex is growing thicker and the quality of your thoughts, decisions and actions has improved.

1 year Your excess risk of coronary heart disease, heart attack and stroke has dropped to less than half that of a smoker.

5 years Your risk of a subarachnoid hemorrhage has declined to 59% of your risk while still smoking (2012 study). If a female ex-smoker, your risk of developing diabetes is now that of a non-smoker (2001 study).

5 to 15 years Your risk of stroke has declined to that of a non-smoker.

10 years Your risk of being diagnosed with lung cancer is between 30% to 50% of that for a continuing smoker (2005 study). Risk of death from lung cancer has declined by almost half if you were an average smoker (one pack per day). Risk of cancer of the mouth, throat, esophagus and pancreas have declined. Risk of developing diabetes for both men and women is now similar to that of a never-smoker (2001 study).

12.5 years Fifty percent of the lost thickness of the brain's outer layer -- the cortex -- has been restored in a 30 pack-year ex-smoker (2015 study).

13 years The average smoker lucky enough to live to age 75 has 5.8 fewer teeth than a non-smoker (1998 study). But by year 13 after quitting, your risk of smoking induced tooth loss has declined to that of a never-smoker (2006 study).

15 years While smokers and ex-smokers have more visceral fat, a larger ratio of visceral to subcutaneous adipose tissue and a higher incidence of elevated plasma triglyceride levels, hyperglycaemia and the metabolic syndrome than nonsmokers, according to a 2011 study, after 15 years the ex-smoker's fat ratios and risks are comparable to those of a never-smoker.

15 years Your risk of coronary heart disease is now that of a person who has never smoked. Your risk of pancreatic cancer has declined to that of a never-smoker (2011 study - but note a 2nd pancreatic study making an identical finding at 20 years).

20 years If a female, your excess risk of death from all smoking related causes, including lung disease and cancer, has now reduced to that of a never-smoker (2008 study). Risk of pancreatic cancer has also declined to that of a never-smoker (2011 study).