Tanning addiction: A new study suggests it is possible to be addicted to tanning.

(NBC NEWSCHANNEL) A new study suggests it is possible to be addicted to tanning.

Researchers at Massachusetts General Hospital exposed mice to a daily dose of U-V radiation for six weeks.

After a week of exposure researchers found elevated endorphin levels in the mice.

Those are "feel-good" hormones that have an impact similar to heroin -- and the levels in mice after one week were high enough to blunt their sensation of pain.

When the trial ended the mice were given a drug to block the feel-good hormones -- and they experienced symptoms of withdrawal and would not return to the areas where they had been given the drug.

While they study is in mice, researchers say it proves U-V exposure could trigger addictive behaviors.

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