P3‐329: SMOKING AND WHITE MATTER HYPERINTENSITY GRADE PROGRESSION IN THE ATHEROSCLEROSIS RISK IN COMMUNITIES (ARIC) STUDY. (1st July 2014) - Power, Melinda C.; Deal, Jennifer; Jack, Clifford R.; Knopman, David S.; Sharrett, A. Richey; Mosley, Thomas; Gottesman, Rebecca F.