The 2017 Oregon Healthy Teens Survey indicates that many students in the Greater Portland area do not grasp the importance of delaying marijuana use until their brain structures are more developed. Multnomah County, of which Portland is the county seat, reported both 8th graders and 11th graders using marijuana at rates higher than the state average. However, neighboring Clackamas County suffered from the highest rate of underage marijuana users, with 25% of 11th graders indicating they currently use marijuana. Furthermore, neighboring Columbia County reported the highest rate of 8th-grade usage at an alarming 10.4%. Conversely, both Washington County and Yamhill County fell well below the Oregon state average for usage among both 8th graders and 11th graders.