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20 Minutes: Pulse and Blood Pressure

Within half an hour of your last cigarette, your heart rate and blood pressure typically drop to normal levels. That’s good, because high blood pressure is known as “the silent killer” for its dangerous effects that often have no symptoms. These include heart attack, stroke, loss of vision, and more. A pulse that’s too fast is harder on your heart. It can cause tiredness, dizziness, chest pain, and breathing problems.

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12 Hours: Carbon Monoxide

When you smoke, you have 3 to 15 times more of this toxic chemical in your blood than someone who doesn't smoke. At higher levels, you might have a headache, faster pulse, dizziness, or nausea. That level drops to normal less than a day after you quit. That makes room for more oxygen in your red blood cells that you need for your heart, brain, and other organs.  

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24 Hours: Heart Attack Risk

Smoking is the top cause of heart attacks. Your risk goes down after just 1 day without cigarettes and continues to drop after that. If you’ve already had a heart attack and cut out cigarettes, you cut your chance of having another one in half. 

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48 Hours: Sense of Smell and Taste

Toxins in cigarette smoke kill the cells that help you taste and smell. Fortunately, these cells seem to grow back quickly when you stop smoking.   

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72 Hours: Bronchial Tubes

Cigarette smoke inflames these pathways through which air moves in and out of your lungs. That can make it harder to breathe. But it starts to get much better just 72 hours after you quit as the tubes start to relax. You might notice a boost in energy, too. 

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2 to 12 Weeks: Blood Circulation

It should start to improve almost immediately, but after a couple of weeks or more you might notice even bigger improvements. You may start to feel sensations more easily, and your hands and feet will be warmer as well. Good circulation is also linked to healthier blood pressure, pulse, and blood-oxygen levels.

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1 to 9 months: Lung Function

Here’s where you really might start to feel like you have more energy. You’ll start to cough less and breathe better. Tiny hairs in your lungs called cilia start to grow back. These help clean out your lungs and lessen infection. Your lung function could go up by as much as 10%.

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1 year: Heart Health

You risk of both heart disease and heart attack drop to about half that of a smoker. Nothing else you can do has such a dramatic effect on heart health.

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2 to 5 Years: Cancer

Smoking raises your risk for certain cancers. You can help lower it again if you quit. After 5 years, your risk of mouth, throat, esophageal, and bladder cancers will be just half of what it was when you smoked. Your risk of cervical cancer will fall to that of a nonsmoker.

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5 Years: Stroke

Smoking speeds up the formation of blood clots that can lead to a stroke. But in as few as 5 years after you quit, your risk of stroke could fall to the same as that of someone who doesn't smoke.

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10 Years: Lung Cancer

That’s how long it takes to cut your lung cancer risk to half that of a person who still smokes. At this time, your risk of cancer of the larynx and of the pancreas also goes down. 

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15 Years: Heart Disease

Congratulations! You've done much to reverse the damage that cigarette smoking causes. Your risk of both heart disease and heart attack is now the same as someone who has never smoked.

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Sources | Medically Reviewed on 06/25/2019 Reviewed by Jennifer Robinson, MD on June 25, 2019


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American Cancer Society: “Benefits of Quitting Smoking Over Time.”

American Diabetes Association: “Foot Complications.”

American Heart Association: “Tachycardia: Fast Heart Rate,” “Why High Blood Pressure is a ‘Silent Killer," "Health Threats from High Blood Pressure."

American Medical Association Journal of Ethics: “Health Effects of Smoking and the Benefits of Quitting.”

British Lung Foundation: “When will I feel better if I stop smoking?”

CDC: "Carbon Monoxide Poisoning: Frequently Asked Questions."

Cleveland Clinic: “Smoking.”

Dutch National Institute for Public Health and the Environment: “Carbon monoxide (CO).”

Harvard Health Publishing: “How’s your heart rate and why it matters?”

Mayo Clinic: “Bronchitis.”

National Capital Poison Center: “Another Reason Not To Smoke: Carbon Monoxide Poisoning.”

British National Health Service: “How smoking affects your body,” “What happens when you quit?”

Medscape: “Impact of Tobacco Smoking and Smoking Cessation on Cardiovascular Risk and Disease.”

National Institutes of Health: "Benefits of Quitting."

Nemours Foundation: “Definition: Bronchial Tubes.”

Respiratory Health Association: “Health Benefits of Quitting.”

Tobacco Induced Diseases: “Effect of cigarette smoke on gustatory sensitivity, evaluation of the deficit and of the recovery time-course after smoking cessation.”

The Laryngoscope: “Smoking and olfactory dysfunction: A systematic literature review and meta‐analysis.”

UnityPoint Health: “Holy Smoke! 15 Surprising Benefits of Quitting Smoking.”

University of Rochester Medical Center: “Carbon Monoxide (Blood).”

World Health Organization: "Fact sheet about health benefits of smoking cessation."

Reviewed by Jennifer Robinson, MD on June 25, 2019

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.