Common causes of cancer
TANNING BEDS: If you've heard that tanning beds are a safe alternative to sunbathing, take a look at the woman's leg in this photo. Katie Donnar, 18, shows her scar from where the melanoma was on the calf of her leg. She's sitting in front of a tanning bed like the one she used at her home and at tanning salons. Donnar was in the sixth grade when she started using tanning beds. AP Photo/ Daniel R. Patmore
