What was found
DURING THE TAKEOFF ROLL, THE FIRST OFFICER NOTICED SMOKE COMING OUT OF HIS GASPER VENT. THE FIRST OFFICER CALLED OUT "80KNOTS," FOLLOWED BY "SMOKE IN THE COCKPIT." AS THE FIRST OFFICER CALLED OUT "SMOKE IN THE COCKPIT," CAPT COULD SEE AND SMELL THE SMOKE COMING OUT OF HIS GASPER. THEN EXECUTED THE REJECTED TAKEOFF PROCEDURE BETWEEN 80-100KTS. MTX PERFORMED ENGINE RUNS AND COULD NOT DUPLICATE THE ISSUE. THE AIRCRAFT WAS RETURNED TO SERVICE.