COCKPIT AND CABIN SMOKE AND FUMES AFTER TKOF RESULT IN A RETURN TO LAND AT SMF; CA.

Narrative

IMMEDIATELY AFTER LIFTOFF A STRONG ODOR THAT SMELLED LIKE A HOT AIR CONDITIONING PACK WAS PRESENT IN THE COCKPIT. LESS THAN 1 MIN AFTER NOTICING THE SMELL; THE #1 FLT ATTENDANT OPENED THE COCKPIT DOOR AND TOLD ME THEY HAD SMOKE IN THE CABIN. THE SMELL WAS MUCH STRONGER WITH THE DOOR OPEN AND LOOKING INTO THE CABIN I COULD SEE SOME BLUISH-WHITE SMOKE NEAR THE CEILING IN COACH. WE LEVELED OFF AT 3000 FT; DECLARED AN EMER AND MADE A R TURN TO A DOWNWIND TO RWY 34L AT SMF. WE MADE AN UNEVENTFUL AND SMOOTH OVERWT LNDG AT A WT OF 142400 LBS WITH ALL OF THE BEFORE LNDG CHKLIST COMPLETED. TOTAL TIME IN THE AIR WAS LESS THAN 6 MINS. AFTER STOPPING ON THE RWY; I REOPENED THE COCKPIT DOOR AND ALL OF THE SMOKE AND MOST OF THE SMELL WAS GONE. THE FLT ATTENDANTS RPTED THAT IT STATED TO DISSIPATE DURING OUR DSCNT; AND WAS COMPLETELY GONE DURING OUR LNDG ROLLOUT. BASED ON THIS INFO AND WITH THE CONCURRENCE OF THE CFR CHIEF WHO COULD SEE NO EVIDENCE OF A PROB FROM THE OUTSIDE; I ELECTED NOT TO EVAC THE ACFT; AND TAXIED IT BACK TO THE GATE WITH PACKS OFF. MAINT RPTED THAT THEY FOUND AN OIL LEAK ON THE L AIR CYCLE MACHINE.