Smoking permanently damages DNA, study shows

(KRON) — A new study finds that more than 7,000 genes can be altered from smoking cigarettes.

Researchers looked at blood samples taken from 16,000 people in past studies.

People who quit smoking had their genes repaired within five years after they stopped, according to the study.

“Although this emphasizes the long-term residual effects of smoking, the good news is the sooner you can stop smoking, the better off you are,” said the author of the study, Dr. Stephanie London.

She works for the U.S. National Institute of Environmental Health Sciences who conducted the study.

Some people’s genetics stayed the same even 30 years after they quit. provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Commenters who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others and keep the conversation on topic and civil. If you see an inappropriate comment, please flag it for our moderators to review.

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