Sun worshippers beware: tanning may be addictive

A study published on Thursday found that chronic exposure to ultraviolet radiation triggers the release of endorphins - the so-called feel-good hormones - that function through the same biological pathway as highly addictive opiate drugs such as heroin and morphine. David Fisher, the Edward Wigglesworth Professor of Dermatology and chair of the Department of Dermatology at Massachusetts General Hospital, led the study.

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