Tobacco Smoke Changes Chemical Code on DNA

Tobacco Smoke Changes Chemical Code on DNA
A new study helps explain how tobacco smoke causes changes to DNA. Reuters reports researchers have found tobacco smoke changes a chemical code on DNA, which can sometimes alter gene activity. Some of the DNA changes reverse when a person quits smoking, but others do not, the researchers report in the journal Circulation: Cardiovascular Genetics . “Many people think that after five years your health is mostly back to that of a nonsmoker, but that may not be the case,” lead study author Roby Joehanes of Beth Israel Deaconess Medical Center and Harvard Medical School in Boston told Reuters.
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