Quitting, at the very least, is one of the most effective ways to reduce lung cancer risk. The benefits start after the last cigarette and remain for years. But the risk does not disappear immediately. How much it drops depends on how long and how heavily a person smoked and how long after quitting.
Your Risk Starts Falling After You Quit
Cigarette smoking is the leading risk factor for lung cancer. Smoking is a way to keep your lungs exposed to a lot of chemicals (known to cause cancer) and not quitting. Once you stop smoking, that exposure ends and you start recovering from it.
All people who smoked for many years can also get health benefits at any age. The earlier a person quits, the more health benefits they can gain over time.
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What Happens Over the Years?
The reduction of lung cancer risk is slow but not sudden.
According to the CDC, 10 to 15 years after quitting, the added risk of lung cancer drops by about half compared to continuing to smoke. The National Cancer Institute similarly reports that after 10 years, former smokers can have a 30% to 60% lower lung cancer risk than those who continue smoking.
The benefit varies from person to person. The longer-term risk of someone who has smoked heavily for a number of decades is different from somebody who has smoked less or quit at a younger age.
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Quitting Also Helps the Lungs
The benefits aren’t limited to cancer prevention. Giving up smoking also reduces coughing and shortness of breath and lowers the risk of respiratory infections. It also reduces the risk of COPD and delays lung function decline in people with COPD.
These improvements can make everyday activities easier and support better overall respiratory health.
Does the Risk Become Zero?
No. A former smoker's lung cancer risk can become much lower after quitting, but not necessarily the same as the risk of someone who never smoked. The remaining risk will depend on smoking history and time since quitting.
This is why quitting is valuable even after many years of smoking.
Should Former Smokers Consider Screening?
Some people with a significant smoking history may be eligible for lung cancer screening. A person’s age, smoking history, and whether they smoke or quit within a given period of time will affect eligibility.
And people who have a history of smoking should talk with a health professional and share their individual risk and screening choices with them and not assume quitting removes the need for medical advice.
The Takeaway
Quitting smoking can significantly reduce lung cancer risk, but the improvement happens gradually. The risk of lung cancer is approximately half that of someone who continues smoking over 10 to 15 years, the CDC said.
There is no age when quitting is considered too late. Stopping smoking is good for lung health, reduces cancer risk, and can be good for health at any age.
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