Tanning...addiction?

Poeple beleive they not only look healthier when tan, but thinner as well, all with out any change but the color of your skin. One in five college students ara addicted to tanning, but there can be an underlying reason. It realases chemicals in your brain that boost your mood, and one can become dependent on them.
http://www.nytimes.com/2010/06/22/health/22brod.html