The sun is a powerful source of ultraviolet radiation.
But in a new report, researchers say it can also cause cancer.
Researchers say ultraviolet lamps, UV light-emitting devices, UV-filters, UV lamps and UV-emitter lamps are more dangerous than previously thought.
The research is published online in the Canadian Journal of Environmental Health Sciences.
According to the study, UV radiation exposure can be a health risk in many ways, including damage to DNA, skin, eyes and reproductive systems.
In a paper published earlier this year, researchers from the University of Toronto and the University at Buffalo looked at data from about 20,000 people.
They found UV lamps caused about one in 10 cancers in men and about one-third of cancers in women.
And, in women, UV exposure increased the risk of colorectal cancer by one-fourth, a risk that increased to one in nine for women aged 65 and older.
But UV exposure also increases the risk for skin cancer.
“We found that in women aged 55 to 64, UV exposures were associated with a three-fold increased risk of skin cancer,” said study lead author and professor of environmental health at the University Of Toronto David M. Condon.
“In men, we found an additional one-quarter increased risk.”
Condon said UV radiation is more likely to cause cancers in people who live in areas with higher UV levels.
“In addition to being more dangerous to your health, it can have an even more harmful effect on the environment,” he said.
The University of Buffalo and University at Toronto have both been collaborating on research on UV-related cancers.
In the U.S., UV radiation has been linked to skin cancer in recent years, with researchers citing studies showing UV radiation can increase skin cancer risk in women by up to 40 per cent.
Experts are worried that the sun may be causing cancer in Canada because UV radiation from the sun is far more damaging to human health than the sun from the sky.
Scientists say that the increase in cancer risk could be due to the increased exposure from indoor UV-trapping devices, such as UV lamps.
For example, researchers said the UV lamps emit UV light that can be absorbed by the skin and cause skin cancer, which could be why people with sensitive skin are more likely than others to develop it.
U.S. researchers have found that the UVA rays emitted from indoor lamps are 50 per cent more harmful to humans than those emitted from outdoor lamps.