Warnings against sun exposure have overshadowed the risk of skin cancer caused by tanning beds.

Indoor tanning beds were officially classified as a human carcinogen in 2009 as are cigarettes and asbestos.

The findings indicate that frequent tanning-booth exposure will increase your risk of developing skin cancer.

Basal cell carcinoma, a slow-growing cancer, has traditionally been a disease of middle age. But it’s been appearing with increasing frequency in people under 40, especially in women — a demographic that also happens to like indoor tanning — suggesting a link. So researchers at the Yale School of Public Health sought to study the association.