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(CBS NEWS) -- Some smokers are turning to e-cigarettes as an alternative to traditional cigarettes. Now, a new study looks at whether e-cigarettes may be an effective way to stop or reduce smoking.

Bethany O'Grady says e-cigarettes helped her kick her pack-a-day smoking habit.

"I never want to smoke a real cigarette again," she says.

Electronic cigarettes turn a liquid solution into a vapor, and some contain nicotine.

Many believe they can help people quit smoking. But researchers at the University of California, San Francisco followed nearly 1,000 smokers for a year, and found no link between e-cigarettes and quitting, or cutting down on smoking.

"There was no association between having tried an e-cigarette and quitting smoking at one year follow up," says Dr. Rachel Grana of UCSF.

The study authors are calling for regulations prohibiting brands from making claims that e-cigarettes can help people stop smoking, at least until there is scientific evidence.

Researchers acknowledged just 88 of the people who participated in the study used e-cigarettes.

The tobacco vapor electronic cigarette association criticizes the study for its limited data, and says the e-cigarettes are vastly less harmful than tobacco.

Bethany says e-cigarettes worked for her, but wants more research.

If there is a negative aspect, I would like to know sooner rather than later.

For now, she says she'll get her fix from e-cigarettes.

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