Kids who are sunburned early on in life have a greater risk of developing cancer in general of the skin.

Although we have refined the common wisdom that excess sun exposure is always associated with increased risk of skin cancer, the take-home message for the public is still the same - limit sun exposure and use a sunscreen that blocks both UVA and UVB rays.

We treat a lot of patients who have tans and get skin cancer. We tell them to cut back [on their tanning], but they just can't seem to stop.

Still, it makes sense that something in the air might increase the risk of lung cancer because our lungs are just big filters.

If we take pre-menopausal and post-menopausal breast cancer then there was a 40 percent increased risk.

If the link between light exposure and cancer risk can be confirmed, it could have an immediate impact on the production and use of artificial lighting in this country. This might include lighting with a wavelength and intensity that does not disrupt melatonin levels and internal timekeeping.