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“No dose is safe,” he said, explaining that medical professionals say young people who use tanning beds are particularly vulnerable to an increased risk of skin cancers.

“When I started 20 years ago, I almost never saw young people with melanoma,” he said, adding that he now sees people in their early teens with skin cancer.

“One can never be 100 percent sure that one thing is the sole cause” of cancer, he said. “But certainly multiple researchers have agreed that UV rays are a carcinogen.”