SMOKE IN THE CABIN AND COCKPIT DURING TKOF ROLL CAUSED THE FLC TO DECLARE AN EMER AND RETURN TO LAND.

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ON TKOF ROLL IN ATL A STRONG PUNGENT SMELL WAS NOTICED IN THE COCKPIT AND CABIN -- PARTICULARLY THE AFT PART OF CABIN AND GALLEY AREA IN FRONT. THE COCKPIT WAS NOTIFIED JUST AFTER LIFTOFF. THE SMOKE/SMELL LASTED FOR APPROX 5 MINS AND THEN DISSIPATED. IN THE MEANTIME WE DECLARED AN EMER AND RETURNED FOR LNDG BACK IN ATL. ACFT WAS STOPPED ON TXWY SINCE SMOKE HAD COMPLETELY DISSIPATED. ENGS WERE SHUT DOWN AND ALL PAX WERE INSTRUCTED TO REMAIN IN THEIR SEATS. THE FLT ATTENDANTS HAD BEEN INSTRUCTED TO BE READY FOR AN EMER EVAC ONLY IF NECESSARY. WHILE COMMUNICATING WITH GND AND FIRE DEPT (APPROX 2 MINS AFTER STOPPING) AN ELECTRICAL SMOKE WAS NOTED IN THE COCKPIT. THE FIRE DEPT WAS INSTRUCTED TO OPEN THE AFT AIRSTAIRS AND A PRECAUTIONARY EVAC WAS EXECUTED THROUGH THE AFT AIRSTAIRS. THE FLT ATTENDANT REMAINED READY TO PERFORM AN EMER EVAC -- BUT THAT WAS UNNECESSARY. ALL PAX AND CREW EXITED WITH NO INJURY OR FURTHER PROBS. I FEEL THE FLT ATTENDANTS PERFORMED IN AN EXEMPLARY MANNER IN MAINTAINING A CONSTANT COM WITH THE FLC AND AS EXPEDITIOUSLY AS TIME PERMITTED KEEPING PAX INFORMED TO MAINTAIN CTL AND PREVENT A PANIC SIT. THE FO CONTINUED TO FLY THE ACFT (AUTOPLT INOP) AND COM WITH ATC FOR A QUICK RETURN. THIS ALLOWED ME; AS CAPT; TO COORD AND COM TO ATC FLT ATTENDANTS AND THE FO. THIS REALLY WORKED GREAT. THE GND EMER. TEAM (FIRE DEPT) RESPONDED VERY QUICKLY AND WERE VERY HELPFUL. WE DID HAVE A LITTLE TROUBLE COMS DIRECTLY WITH THEM. THIS DELAY IN COM CAUSED SOME DELAY IN LOWERING THE AFT AIRSTAIRS. I FEEL THE GND TEAM NEEDS TO BE ABLE TO PLUG INTO THE ACFT INTERPHONE SYS TO TALK DIRECTLY WITH THE CREW. IN OTHER WORDS LET'S BE READY FOR ALL LEVELS OF EVAC OR EMER (FROM A CTLED EVAC TO AN EMER EVAC).