A320 FLC ABORTS TKOF AFTER FLT ATTENDANT RPTS SMOKE FROM AIR CONDITIONING VENTS.

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DURING TAXI OUT; PAX THOUGHT SHE HEARD ABNORMAL NOISE. WE WERE #2 FOR TKOF. AFTER CONSULTATION WITH FLT ATTENDANT; WE DETERMINED THAT THE NOISE WAS NORMAL. WE ELECTED TO CONTINUE. DURING TKOF ROLL; AFTER 80 KT CALLOUT; FLT ATTENDANT BEGAN HITTING COCKPIT DOOR AND YELLING STOP; SO WE ABORTED THE TKOF AT APPROX 120 KIAS. AFTER CLRING RWY; WE WERE TOLD THERE WAS A LOT FO WHAT APPEARED TO BE CONDENSATION POURING FROM THE AIR CONDITIONING SYS VENTS (IT WAS VERY HUMID IN CHICAGO). AFTER SPEAKING TO FLT ATTENDANT THAT WAS HITTING OUR DOOR; WE LEARNED THAT THE ENTIRE MIDDLE SECTION OF ACFT PAX WERE FRIGHTENED/ALARMED/SCARED OF THE WHITE SUBSTANCE POURING FROM THE VENTS; AND THEY WERE SCREAMING AS WE WERE GOING DOWN THE RWY. FOR THAT REASON; THE FLT ATTENDANT WAS BANGING ON THE COCKPIT DOOR AND YELLING STOP. GIVEN TODAY'S ENVIRONMENT; AND THE ONE RPT OF AN ABNORMAL NOISE (ALTHOUGH WE HAD DECIDED FOR OURSELVES ALONG WITH THE FLT ATTENDANT THAT IT WAS NORMAL AIRBUS NOISE); ADEQUATE RWY REMAINING; WE ELECTED TO ABORT THE TKOF NOT KNOWING WHAT SIT WAS DEVELOPING IN THE CABIN.