Amy Myers talks with her son Kamron, 18, in the backyard of their home in Boise, Idaho. She has found raising a teenager to be extremely stressful. Kyle Green for NPR hide caption

itoggle caption Kyle Green for NPR

A worker cleans the home of a hoarder in Las Vegas. Teens may not have the time to accumulate this much stuff, but they still have symptoms. AP/City of Las Vegas via Las Vegas Review-Journal hide caption

itoggle caption AP/City of Las Vegas via Las Vegas Review-Journal

Singer Ke$ha performs during the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas in September. Ethan Miller/Getty Images hide caption

itoggle caption Ethan Miller/Getty Images

High school students whose friends posted photos of drinking and smoking were about 20 percent more likely to become drinkers or smokers themselves. iStockphoto hide caption

itoggle caption iStockphoto

The teenage years are the last golden opportunity to build a healthy brain, researchers say. So smoking pot might not be so smart. Tomas Rodriguez/Corbis hide caption

itoggle caption Tomas Rodriguez/Corbis

Teenagers' sleep patterns may be a clue to their risk of depression. iStockphoto hide caption

itoggle caption iStockphoto

Even if you're under 25, you should still know your blood pressure, a study says. Rudyanto Wijaya/iStockphoto hide caption

itoggle caption Rudyanto Wijaya/iStockphoto

Smoking can mess up your looks, according to an ad campaign aimed at keeping teens from smoking. Courtesy of U.S. Food and Drug Administration hide caption

itoggle caption Courtesy of U.S. Food and Drug Administration