What was found
WHILE ADDING POWER DURING TAKE OFF, THE CABIN FILLED WITH SMOKE AND THE CREW ABORTED TAKE OFF. THE CREW ENSURED ALL PASSENGERS WERE FIT TO RETURN TO THE GATE. AFTER RETURNING TO THE GATE, MAINTENANCE INSPECTED AND FOUND DE-ICE FLUID HAD GOTTEN INTO THE APU ANDHAD CAUSED THE SMOKE. MAINTENANCE THEN PERFORMED A GROUND OPERATIONAL CHECK WITH THE AIRCRAFT. BOTH THE PACK SYSTEM AND APU SYSTEM CHECKED GOOD. THE AIRCRAFTWAS THEN RELEASED FOR SERVICE.