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Study: Weight Gain After Quitting Smoking Averages Around 10 Pounds

Brand X Pictures/Thinkstock(NEW YORK) -- As more people quit smoking cigarettes to protect their health, many face a new battle: weight gain.  A new study in the journal BMJ shows that quitters gain more weight than anyone previously thought.

The research found that those who quit smoking gained an average of 10 to 11 pounds after 12 months, with most of the weight gain in the first three months.

Still, that shouldn't stop people from kicking the habit for good, the researchers said.

Scientists from France and the U.K. conducted a meta-analysis that examined 62 European-based studies of weight gain among people who had successfully stopped smoking.  They said the average weight gain was higher than doctors generally thought, though there were substantial differences among study participants.

Until now, the National Institutes of Health in the U.S. has been saying that not everyone will gain weight after quitting, and those who do will generally gain fewer than 10 pounds.

"Most of the post-cessation weight gain occurs quickly, during the first quarter," said Henri-Jean Aubin, an addiction specialist who was lead author of the study.  "Weight gain decelerates afterwards.  There is a great inter-individual variability of post-cessation weight gain."

About 16 percent of people actually lost weight after quitting, and 13 percent gained more than 22 pounds.  Because of the great range, researchers said the average weight gain is not necessarily meaningful to people kicking the cigarette habit.

Researchers said the study results should encourage physicians to acknowledge the risk of added pounds.  Doctors need to encourage their patients to adopt a healthy diet and to exercise regularly, they said.

"On the other hand, weight-concerned smokers should consider the possibility they may not gain weight while quitting smoking," said Aubin.

It is worth noting that this type of meta-analysis has its limitations because investigators did not measure participants' weights directly, but, rather, studied a collection of studies, said Robert Amler, dean of the School of Health Sciences at New York Medical College.

"Each of the collected studies weighed different groups of people [with] different ages, different baseline weights, different ethnicities under different circumstances, which means that each study yielded results that may imply something different than the others' results," Amler said.

Copyright 2012 ABC News Radio

ABC News Radio