A CL65 FLT CREW EXPERIENCE SMOKE IN THE COCKPIT JUST AFTER TKOF RESULTING IN A RETURN TO THE DEP ARPT.

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WE WERE DEICED AT THE GATE WITH TYPE I AND IV FLUIDS. WE WAITED A COUPLE MINS TO START THE APU; THEN 2 MORE TO OPEN BLEEDS AND 2 MORE TO TURN ON THE PACKS. WE DEPARTED SBN. AT ABOUT 600 FT WE STARTED TO GET SMOKE IN THE COCKPIT. WE DONNED OUR OXYGEN MASK. HOWEVER THE FO'S MASK MIKE DID NOT WORK. (THE MASK TESTED SUCCESSFULLY ON THE GND.) HE HAD THE TOGGLE SWITCH SELECTED TO MASK. WE BOTH CHKED THIS. THE FO WAS OUT OF THE LOOP DEALING WITH HIS MASK FOR A COUPLE OF MINS. WE GOT VECTORS BACK AROUND TO RWY 9R. WE DID NOT ACTUALLY STATE TO ATC AN 'EMER' (DECLARING IT) BUT THEY HAD CFR STANDING BY. WE DID NOT HAVE TIME TO RUN AN ABNORMAL CHKLIST. WE WERE VECTORED IN CLOSE AND LOW FOR A VISUAL; BUT WERE UNABLE TO GET RWY UNTIL TOO LATE. WE WERE HIGH. WE TRIED A 360 DEGS BACK TO FINAL LOSING ALT; BUT WE WERE UNABLE TO LOCATE IT. WE WERE VECTORED OUT FURTHER FOR A SURVEILLANCE APCH. WE SUCCESSFULLY LANDED OVERWT. BY THIS TIME WE TOLD THE FLT ATTENDANT WE WERE RETURNING WITHOUT GIVING HIM MUCH FURTHER INFO. (TIME CONSTRAINT) BY THE TIME WE WERE ON FINAL THE SMOKE HAD DISAPPEARED. FLT ATTENDANT SAW NO SIGNS OF SMOKE. WE TAXIED TO THE GATE AND DEPLANED THROUGH THE MAIN CABIN DOOR. THIS FLT ATTENDANT THEN TOLD US HE HAD SMOKE AT FLOOR LEVEL IN THE LAST 3 ROWS; DURING OUR RETURN BUT HAD CLRED PRIOR TO OUR LNDG. THE SMOKE HAD A SWEET ODOR TO IT LIKE BURNING GLYCOL. HOWEVER; IT SMELLED LIKE IT WAS A BURNING SMELL LIKE DUST IN A FURNACE THAT YOU USE FOR THE FIRST TIME IN WINTER. HAVING THE FO OUT OF THE LOOP FOR A COUPLE MINS LIMITED IN THE TERMS OF TIME TO GET EVERYTHING DONE (IE; TALK TO FLT ATTENDANT). WE DID CALL HIM ONCE WE LANDED ABOUT STAYING SEATED UNTIL WE GOT TO THE GATE AND DEPLANE OUT THE MAIN CABIN DOOR. ALSO THE REDUCED VISION OF HAVING THE MASK ON. IT LIMITS YOUR PERIPHERAL VISION. IT HINDERED MY ABILITY TO LOCATE THE RWY. ALTHOUGH WE DO NOT RUN AN ABNORMAL CHKLIST FOR THE SMOKE WHICH WAS LIKELY BURNING OFF; IT SEEM BETTER TO GET THE ACFT ON THE GND.