Will my lifespan increase if I stop smoking?

Yes, your lifespan can increase if you stop smoking. Those who quit smoking before the age of 35 have a life expectancy similar to a person who has never smoked. However, the longer you smoke, the more likely you are to develop some irreversible health effects of tobacco use. Smokers have about twice the risk of non-smokers of dying from heart disease, but within one year of quitting, this risk is reduced by about half and continues to decrease gradually. Quitting smoking will also reduce your risk of stroke. For those who have lung disease, quitting smoking will decrease the progression of the disease and may, therefore, prolong life. Quitting additionally reduces the risk of developing lung cancer and, within 10 years of quitting, this risk is 30-50% of the risk for someone who continues smoking.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Smokers have one thing in common besides bad breath and smelly clothes: An increased risk for premature death. Forget about those stories you often hear about old timers who smoked three packs a day and lived to be 100. There are exceptions to every rule. And the rule is this: Smokers tend to die before their time.

Fortunately, quitting can literally add years to your life. A smoker who gives up tobacco at age 30 reduces his or her risk of premature death from a smoking-related cause by 90%, according to the National Cancer Institute. Quit at age 50 and you cut your odds of dying prematurely in half. And it's never too late. Even seniors who stop smoking can push back their expiration date.
Because smoking increases the risk for lung cancer and vascular disease, quitting and not smoking for 5 to 15 years would decrease these risks. A person’s lifespan, however, also depends on any smoking-related diseases that may already be present and at what stage of development these diseases are.
Dr. Michael Roizen, MD
Internal Medicine
Assuming you stop early enough and before you are on the way to six feet under, yes, but even more importantly than your life span increasing, your quality of life will improve and you will have, if you are typical, between 8 and 18 fewer years of disability, pain, and suffering because you quit. Stopping smoking is the smartest thing you can do.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.