Heavy Smoking as Teenager Might Add Pounds Later

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Why might smoking lead to obesity? Saarni said it could have something to do with changes in the body's metabolism -- its ability to process food and keep fat from building up.

Michael Siegel, professor at Boston University School of Public Health, said there may not be a direct link.

Most likely, he said, "smokers tend to have a constellation of poor health habits, including poorer diet and less physical activity. It is most likely that these factors, and not the smoking itself, is causing them to become obese."

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Dr. Ted Schettler, science director at the Science and Environmental Health Network, said the study is limited. Among other things, he said, it didn't examine the full diets of the twins to see if they ate more fatty foods.

"I'd be reluctant to draw any conclusions from this study," he said.

More information

Learn more about smoking from the U.S. National Institutes of Health.

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