ACR TAXIING AFTER LNDG HAS CABIN FILL WITH SMOKE. EVACED ACFT.

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VISUAL APCH TO RWY 13. AFTER NORMAL LNDG WE TURNED OFF THE RWY AT TAXIWAY X. I CALLED FOR TAXI CLRNC TO GATE. AFTER RECEIVING TAXI CLRNC; CAPT CALLED FOR 'FLAPS UP AFTER LNDG CHK.' AFTER DOING MY 'AFTER LNDG FLOW'; UP TO THE POINT TO TURNING ON THE APU MASTER SWITCH - WAITING THE 20 SECONDS FOR THE 'FLAP OPEN LIGHT' - I LOOKED R TO MAKE SURE THE OUTER TAXIWAY WAS CLR AND I NOTICED A SMALL AMOUNT OF SMOKE OR A PUFF OF SMOKE. BEFORE I COULD SAY ANYTHING TO THE CAPT; THE CABIN INTERPHONE BUZZER WENT OFF. THE AFT FLT ATTENDANT TOLD US 'THE CABIN WAS FILLING UP WITH SMOKE.' ABOUT 2 SECONDS LATER THE LEAD FLT ATTENDANT OPENED THE COCKPIT DOOR AND TOLD US 'THERE IS SMOKE IN THE CABIN.' THE CAPT BROUGHT THE ACFT TO A STOP AND TOLD ME TO GET UP AND TAKE A LOOK BACK. I SAW SMOKE IN THE MID TO REAR CABIN. THE SMOKE WAS SO DENSE THAT I COULD NOT SEE ALL THE WAY TO THE REAR OF THE CABIN. I TOLD THE CAPT THAT 'THERE IS A LOT OF SMOKE IN THE CABIN.' THERE WERE NO INDICATIONS ON THE ECAM OR ANY SMELL IN THE COCKPIT. AT THAT MOMENT THE LEAD FLT ATTENDANT ASKED THE CAPT 'WE NEED TO EVAC IS IT ALL RIGHT?' THE CAPT SAID YES EVAC. I IMMEDIATELY CALLED GND CTL AND TOLD THEM WE HAVE SMOKE IN THE CABIN WE ARE GOING TO EVAC GET THE FIRE TRUCKS OUT HERE. THEN I CALLED ON THE COMPANY FREQ AND TOLD THEM 'WE HAVE CABIN SMOKE; WE ARE GOING TO EVAC.' THEN I GOT OUT THE EVAC CHKLIST. THE LEAD FLT ATTENDANT HAD STARTED THE EVAC AS SOON AS THE CAPT HAD SAID YES TO HER QUESTION. I READ THE EVAC CHKLIST; THEN GRABBED MY FLASHLIGHT; AND WENT TO THE FORWARD CABIN. TO MY SURPRISE; ALMOST EVERYONE WAS OFF THE ACFT. I HELPED AN OLDER LADY ONTO THE SLIDE THEN EXITED THE ACFT MYSELF OUT THE FRONT R DOOR. THERE WERE MECHS BAGGAGE HANDLERS AT THE SLIDE HELPING PEOPLE. THEY DID A GREAT JOB OF CROWD CTL. THEY HAD ALMOST ALL OF THE PEOPLE AWAY FROM THE ACFT AND HDG TOWARDS THE TERMINAL. AFTER MAKING SURE EVERYONE WAS AWAY FROM THE ACFT I WALKED AROUND THE REAR OF THE ACFT AND COULD NOT FIND ANY INDICATIONS OF SMOKE OR ANYTHING ABNORMAL. SUPPLEMENTAL INFO FROM ACN 202579: THE THING THAT SHOULD HAVE BEEN DONE DIFFERENT IS I SHOULD HAVE TOLD THE FLT ATTENDANT OVER THE P.A. TO EVAC. AS SOON AS I TOLD THE LEAD FLT ATTENDANT TO EVAC THE DOOR CAME OPEN AND THE SLIDES OUT AND THE AFT FLT ATTENDANTS WERE L IN THE DARK FOR A FEW SECONDS BEFORE THEY STARTED THE EVAC. THE FIRST THING I DID WAS SHUT THE ENGS OFF BECAUSE THE FORWARD SLIDES DEPLOYED IN FRONT OF THE ENGS. AFTER THE ENGS ARE SHUT DOWN THERE IS A 7 SECOND DELAY BEFORE I COULD HAVE USED THE P.A. AGAIN. ALL 123 PEOPLE AND CREW OF 7 WERE EVACED IN A VERY SHORT TIME; ONLY ONE FLT ATTENDANT WAS TAKEN TO THE HOSPITAL WITH A CUT ON HER HEAD. THIS EVAC HAPPENED CLOSE TO OUR RAMP AND THE AGENTS HELPED THE PEOPLE AS THEY CAME DOWN THE SLIDES. ALL AND ALL EVERYTHING WENT PRETTY SMOOTH.