The number of teenagers and young adults going to the emergency room at Children’s Hospital Colorado for what appears to be marijuana-related reasons increased significantly after legalization, a new study by a Children’s doctor found.

Dr. Sam Wang said his study contrasts with surveys that suggest youth marijuana use in Colorado has not increased since legalization. But he said the study also has its limitations, meaning it adds important data to the debate over legalization but is not the final word on it.

“Everything has to be taken with a grain of salt,” he said. “I don’t think one database is perfect. But this is just another way to look at the data that shows more teenagers are coming to the ER.”