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You don’t want your generations to be born with some sort of defects and health issues, do you?
 According to a new study smoking can damage DNA in clear patterns, though most damage fades over time, but not all of it.
The marks are made in a process called methylation, which is an alteration of DNA that can inactivate a gene or change how it functions -- often causing cancer and other diseases.

"Our study has found compelling evidence that smoking has a long-lasting impact on our molecular machinery, an impact that can last more than 30 years," said Roby Joehanes of Hebrew SeniorLife and Harvard Medical School.
Well, medically heart disease and cancer are both cause by genetic damage, but these days most of it caused by day-to-day living. Smoking is one of the biggest culprits.
"The encouraging news is that once you stop smoking, the majority of DNA methylation signals return to never-smoker levels after five years, which means your body is trying to heal itself of the harmful impacts of tobacco smoking," Joehanes said.

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