MD80 CREW EVACED CABIN BECAUSE OF SMOKE AND FUMES.

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SMOKE; FUMES GND EVAC DFW. FO NOTICED A DECREASED L HYD FLUID LEVEL FROM LAST OBSERVATION; BUT ABOVE MINIMUM LEVEL. INFORMED TWR OF NEED TO RETURN TO GATE. CLRED TO CROSS RWY 18L AND TAXI DOWN TXWY E. I STARTED APU. SOON AFTER FLT ATTENDANT RPTED FUMES IN BACK OF CABIN. WE TURNED OFF APU AND TURNED OFF RECIRCULATION FAN. FLT ATTENDANTS RPTED NO IMMEDIATE IMPROVEMENT. TWR SAW NO SMOKE. INFORMED BY FLT ATTENDANTS IN UNAMBIGUOUS WAY THAT THE SMOKE WAS VERY BAD IN BACK. MADE A PA TELLING PAX TO EVAC THROUGH AFT EXIT ONLY; WITH CONCERN OVER POSSIBLE BRAKE AREA FIRE AND ACFT BTWN 2 ACTIVE RWYS. ORDERLY EGRESS FOLLOWED WITH NO INJURIES. SMOKE RAPIDLY CLRED WHEN TAILCONE JETTISONED AND SLIDE DEPLOYED. INITIALLY; I ASKED FLT ATTENDANTS IF THEY COULD OPEN THE MD80 AFT AIRSTAIRS DOOR TO EGRESS. GND SCHOOL INSTRUCTORS SHOWED US THE 'TRICK' DURING UPGRADE TRAINING. FLT ATTENDANTS ARE NOT TAUGHT TO DO THIS. WE CERTAINLY DON'T WANT ANOTHER PARACHUTING INCIDENT; BUT IT WOULD BE A LOWER RISK OPTION FOR DEPLANING IF THE CIRCUMSTANCES WARRANT IT. B727 TYPE AERODYNAMIC VANE SEEMS LIKE A BETTER WAY TO PRECLUDE USE INFLT. WHEN AFT SLIDE DEPLOYED; I EXPECTED A SLOW DOWN; 'VELCRO' ZONE AT THE BOTTOM OF SLIDE. YOU REALLY SCOOT DOWN THAT SLIDE AND IT WOULD BE GOOD TO HAVE SOME FRICTION TO REDUCE SPD AT THE END. DO SOME SLIDES HAVE IT AND SOME DON'T? MALE CATCHERS AT BOTTOM ARE ANXIOUS TO CATCH PRETTY GIRLS; BUT NOT AS ENTHUSIASTIC WHEN A 42 YR OLD MALE IS HEADING THEIR WAY. I SMACKED PRETTY HARD EVEN WITH THEIR HELP. THAT COULD REALLY DO SOME DAMAGE TO A 70 YR OLD LADY.