MD80 CREW HAD SMOKE AND FUMES IN THE COCKPIT.

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WHILE CLBING OUT OF 14500 FT MSL; WHITE SMOKE OBSERVED ENTERING THE CABIN THROUGH THE DASH HEATING VENTS. AFTER DONNING OUR OXYGEN MASKS THE CAPT NOTIFIED ATC OF OUR SIT (SMOKE ENTERING THE COCKPIT) AND REQUESTED AN IMMEDIATE DSCNT AND RETURN BACK TO THE ARPT FROM WHICH WE HAD JUST DEPARTED FROM. SMOKE ENTERED THE COCKPIT FOR ABOUT 15-20 SECONDS MAX. FOLLOWING OUR LNDG AT PBI WE STOPPED ON THE TXWY AND HAD THE EMER VEHICLES INSPECT THE OUTSIDE OF THE ACFT. NO SMOKE OR FIRE WAS OBSERVED BY THE OUTSIDE EMER VEHICLES SO WE TAXIED TO THE GATE AND SHUT DOWN THE ENGS AND OFF-LOADED THE PAX. FOLLOWING A MAINT INSPECTION; IT WAS FOUND THAT THE APU HAD LEAKED SOME OIL ONTO THE L AIR CONDITIONING FILTRATION SYS WHICH HAD TURNED INTO SMOKE WHEN IT WAS HEATED AS IT ENTERED THE AIR CYCLE MACHINE. THE WHOLE SEQUENCE OF EVENTS WAS OVER IN A COUPLE OF MINS. I ROUGHLY ESTIMATE THAT FROM THE TIME SMOKE ENTERED THE COCKPIT TO THE TIME WE WERE ON THE GND WAS BTWN 7-8 MINS. WITH THE ATC COMS; CHKLIST COMPLETION; AND NOTIFICATION OF OUR CABIN CREW WE WERE PRETTY BUSY. THANKFULLY THE TRAINING WE HAD RECEIVED IN OUR SIMULATORS HELPED PREPARE US FOR THIS TYPE OF SIT. AS A RESULT; THIS SIT WAS DEALT WITH IN A PROFESSIONAL MANNER. I WISH TO COMMEND ALL OF THE AIR TFC CTLRS WHO ASSISTED US IN THIS SIT. THEIR ASSISTANCE ALLOWED US TO GET BACK TO THE ARPT QUICKLY AND WITHOUT DELAY.