A health alert for parents with teenagers.
Health officials are categorizing indoor tanning with binge drinking, unhealthy dieting, and sexual activity.
The Centers for Disease Control and Prevention found other behaviors were also more common among high school students who use sun lamps or indoor tanning beds, than teens who don't.
That includes drug use among girls, and smoking among boys.
The new CDC survey has been published in the journal of the American Medical Association, Dermatology.
In 2011, about one in five high school girls said they tanned indoors; this number has decreased from earlier years. It was less common among boys.
Skin cancer is linked with tanning. Melanoma, the most serious type of cancer, is rare but increasing among teens.