AN MD80 TAXIING AFTER LNDG DECLARED AN EMER AND EVACED THE ACFT DUE TO SMOKE AND VAPOR IN THE PAX CABIN CAUSED BY A FAILED HYD LINE ALLOWING FLUID TO ENTER THE APU PNEUMATICS.

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ON TAXI IN; AFTER LAND CHKLIST COMPLETE; DISTURBANCE HEARD IN BACK OF ACFT. AT THE SAME TIME FIRST FLT ATTENDANT RPTED SMOKE IN CABIN. CONCURRENT WITH THIS ANNOUNCEMENT SMOKE/VAPORS BEGAN ENTERING THE COCKPIT THROUGH THE AIR-CONDITIONING SYS. THE COCKPIT DOOR WAS OPEN SO WE BOTH LOOKED BACK AND SAW DENSE SMOKE/VAPOR IN PAX CABIN. THE CAPT IMMEDIATELY STOPPED THE ACFT AND INITIATED THE EVAC. I NOTICED THE L HYD QUANTITY READING ZERO. I CALLED SFO GND AND SAID 'FLT XXX EVACING ACFT; SMOKE IN CABIN.' THE CAPT THEN CALLED FOR THE EVAC CHKLIST; AND WE ACCOMPLISHED IT. CREW AND PAX ALL HAD SYMPTOMS FROM SMOKE/VAPOR INHALATION AND THERE WERE SOME MINOR EVAC INJURIES. AT THE TIME THE L ENG AND APU WERE RUNNING. THE SOURCE OF THE VAPOR WAS A FAILED HYD LINE IN THE AFT COMPARTMENT. THE FLUID WAS DRAWN INTO THE AIR- CONDITIONING SYS BY THE APU. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THIS SMOKE AND VAPOR IN THE CABIN IS A SECOND TIME INCIDENT FOR THIS ACFT AND ONE OTHER ACFT IN THE FLEET ALSO EXPERIENCED THE FAILED HYD LINE ALLOWING FLUID TO ENTER THE APU PNEUMATIC SYS. THE RPTR SAID THE FLT ATTENDANTS WERE TREATED FOR THE TOXIC VAPOR. THE RPTR STATED THE ACR IS WORKING UP A FIX TO CORRECT THESE 2 ACFT.