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Drinking sugar-sweetened pop could take years off your life, a new U.S. study has found.

Researchers at the University of California — San Francisco found study participants who drank pop daily had shorter telomeres — the protective units of DNA that cap the ends of chromosomes in cells — in white blood cells. Short telomeres have been associated with chronic aging diseases such as heart disease, diabetes and some forms of cancer.

The researchers calculated daily consumption of a 20-ounce pop is associated with 4.6 years of additional biological aging. The effect on telomere length is comparable to that of smoking, they said.

"This finding held regardless of age, race, income and education level," researcher Elissa Epel said in a press release.

Only adults participated in the study, but Epel said "it is possible that soda consumption is associated with telomere shortening in children."

The study was published online in the American Journal of Public Health.