CABIN ATTENDANT RPT; S80; DFW-EWR; SMOKE IN CABIN AFTER TKOF. RETURN TO DFW. MAINT MET FLT. PLANE TAKEN OTS.

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WE TOOK OFF FROM DFW AND A FEW MINS LATER; AS WE WERE CLBING; I NOTICED THAT ALL PAX WERE TRYING TO FIX THE AIR VENT ABOVE THEIR HEADS. I THOUGHT THEY WERE JUST FEELING HOT; BUT SOME MINS LATER; THE WHOLE CABIN GOT SMOKY -- LIKE DRY ICE KIND OF SMOKE -- WHITE AND FOGGY -- FROM MY JUMP SEAT (POS #2). I CONTACTED THE OTHER FLT ATTENDANTS AND THE CAPT; WHO COULD NOT IDENT THE PROB FROM THE COCKPIT; BUT DECIDED TO LAND SOON. THE CAPT KEPT US VERY WELL INFORMED THE WHOLE TIME. I HAD THE OXYGEN AND HALON EXTINGUISHER READY TO BE USED; BUT IT WAS NOT NECESSARY. THE PAX REMAINED VERY CLAM; AND WE ALL LANDED SAFE. THERE WASN'T A NEED FOR EVAC. AS SOON AS WE LANDED; THE SMOKE DISAPPEARED FROM THE CABIN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE SMOKE OCCURRED 5 MINS AFTER TKOF. THE CAPT IMMEDIATELY DECIDED TO GO BACK TO DALLAS WITHOUT DUMPING FUEL. THEY SWITCHED TO ANOTHER PLANE AND CONTINUED ON WITHOUT INCIDENT. THE PLANE WAS MET BY MECHS AND PAX SVC; AND NO ONE TOLD HER WHAT THE MYSTERIOUS SMOKE WAS.