http://www.glamour.com/health-fitness/2012/04/6-sunscreen-mistakes-leaving-you-vulnerable-to-skin-cancer-may-2012
“When I see a woman with bronzed skin, I look at it the way you might picture the inside of a smoker’s lungs.When UV light traumatizes the skin, brown pigment, or melanin, covers cells like a shield, trying to protect the fragile DNA inside from burning. This happens extremely quickly—within about 20 minutes of being outside without adequate protection. A tan is essentially your skin cells screaming, ‘Ouch!” says Dr. Marmu.
Tanning is definitely our generation’s cigarettes. Not attractive at all.