Did you know that 8 hours after you stop smoking, for most people the carbon monoxide level in the blood becomes normal and the blood’s ability to carry oxygen also returns to normal? 24 hours after you quit smoking, the chance of having a heart attack decrease. 2 weeks-3 months blood circulation and lung function may improve, 1-9 months; lungs can start to clean themselves again. You may notice that you’re coughing les and aren’t as short of breath. 1 year after quitting the excess risk of a heart attack is cut in half!! 5+ years after, the risk of stroke is reduced to the same risk as a person who has never smoked. 10 years after the risk of lung cancer is reduced. There is less risk of caners of the mouth, throat, esophagus, bladder, kidney, cervix and pancreas. And finally, 15 years after you quit, the risk of coronary heart disease and stroke are now the same as a lifelong nonsmokers! Wow that is such good news for people who want to quit smoking. I was surprised that after not smoking for even a short time you are improving your health.