"Number of Scott County Average Age at Which Students Reported First Smoking Marijuana, 2010: by Grade and Gender" ,2010,2010,2010 ,Male,Female,Total 6th,11,11,11 9th,13,13,13 12th,15,15,15 All Grades,14,14,14 Sources: Minnesota Student Survey (MSS) SUMN Web Site: http://sumn.org