AN A320 CAPT; PF; OBSERVED SMOKE ON THE FLT DECK AFTER DEP; WHICH WAS ALSO DETECTED IN FRONT OF PAX CABIN; CAUSING HIM TO RETURN TO JFK.

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DURING CRUISE AT FL350 APPROX 70 MI E OF THE SBY VOR; OPERATING FROM JFK TO PBI; THE FO AND I NOTICED SMOKE RISING FROM THE CTR CONSOLE OF ACFT IN AN AMOUNT ABOUT EQUAL TO A SMOKER'S EXHALE. WITHIN A FEW MOMENTS; THE #1 FLT ATTENDANT CALLED THE FLT DECK TO SAY THEY COULD SMELL BURNING INSULATION; MOSTLY IN THE FORWARD CABIN. NO OTHER SMOKE WAS NOTED; NO EQUIP MALFUNCTIONED; NO ECAM OCCURRED AND NO CIRCUIT BREAKERS WERE NOTED TO HAVE POPPED. WE NOTIFIED ZDC AND SENT AN ACARS MESSAGE TO COMPANY OPS OF THE PROB. THE SMOKE WAS GONE FROM THE FLT DECK PRIOR TO COMPLETION OF THE SMOKE CHKLIST. THE #1 FLT ATTENDANT CALLED AGAIN TO SAY THAT THE SMELL WAS GONE FROM THE CABIN. I INFORMED HER THAT WE WERE GOING TO RETURN TO JFK AND TO ADVISE ME IF THERE WAS ANY CHANGE IN THE CABIN. WE DECLARED AN EMER WITH ZDC. MAINT CTL WAS CONTACTED THROUGH A PHONE PATCH WITH COMMERCIAL RADIO. WE DID GET A LNDG GEAR CTL INDICATOR UNIT 2 ECAM ADVISORY WHILE DSNDING THROUGH 8000 FT APPROX 30 MI FROM JFK. A VISUAL APCH WAS COMPLETED TO RWY 31R AT JFK.