Now, a growing body of evidence suggests that, as with cigarettes, simply knowing the behavior is bad isn't going to stop people if the behavior is addictive. A new study, released Monday in the journal Archives of Dermatology, adds to that body of literature that connects regular visits to a tanning booth with addictive behavior.
The researchers say the study falls short of proving such a link beyond a shadow of a doubt. But for some, the idea that tanning is addictive makes sense.
"I absolutely believe that I was addicted to tanning," said 27-year-old melanoma survivor Kristi Setzer, who said she began a tanning regimen to look good for her wedding in 2006.
"I felt that I would look thinner and not blend in with my wedding dress," Setzer, now a law student, recalled.
After going tanning, she estimates, almost every day for a year before her wedding, she continued afterward, despite better than average knowledge of its possible effects.
"I knew that melanoma had serious consequences," Setzer said. "My uncle actually died after a battle with melanoma, but even though I knew that, I felt compelled to go tan.
"Even after my wedding I continued indoor tanning until August of 2008, when I received my diagnosis of melanoma," she said.
While physicians agree that tanning can have severe and negative effects, a number of things need to be known before it can be considered a true addiction.
"I think there's growing evidence that it can be addicting for a minority of individuals," said Catherine Mosher, a clinical psychologist and post-doctoral research fellow with Memorial Sloan Kettering Cancer Center's Department of Psychiatry and Behavioral Sciences and one of the study's authors. "Addiction is a very complex phenomenon, and it will take evidence from multiple sources to validate the idea that it is an addiction."
For the study, researchers asked 421 students about their tanning habits. Of these, 229 utilized indoor tanning beds. Among this group, between 30 percent and 40 percent, depending on the scale used, met the psychiatric diagnostic criteria for addiction. These "addicted" tanners also claimed more symptoms of anxiety as well as higher use of alcohol, marijuana and other substances.
"It's certainly an eye opener," Dr. James Spencer, a dermatologist in St. Petersburg, Fla., and a spokesman for the American Academy of Dermatology, said of the study. "We think that tanning gives a brief cosmetic change for a lifetime of problems with skin cancer and wrinkles."
But despite that, he said, dermatologists see people continue to tan -- a phenomenon that suggests the benefits are beyond cosmetic.
"People seem into it above and beyond that," Spencer said. "A significant percentage of the self-identified young people going to indoor tanning met the criteria for addiction.
"I think it's helpful for us to understand this behavior," in order to combat it, he said.
Tim Turnham, executive director of the Melanoma Research Foundation, said getting the answer to whether tanning is an addiction will be important in stopping people from getting cancer from it.