Doctors are once warning teenagers not to take the so-called Cinnamon Challenge. ABC's Larry Jacobs reports that the prank still being depicted in videos on the Internet, is causing an increase in hospitalizations. A report in the medical journal Pediatrics says at least thirty teens nationwide needed medical attention after taking the challenge last year. The fad involves daring someone to swallow a spoonful of ground cinnamon in sixty seconds without water. Cinnamon is made from tree bark and contains cellulose fibers that don't easily break down. Aside from choking, it can make it difficult to breathe and cause collapsed lungs. Poison centers report an increase in calls because of it.