LGT HAS SMOKE IN COCKPIT AT TKOF. EMER DECLARED.

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AT ABOUT V1 SMOKE ENTERED COCKPIT; FOLLOWED BY MAIN CARGO WARNING OF FIRE. THIS TYPE OF OCCURRENCE IN CRITICAL PHASE OF FLT POINTS OUT THE PROBS WITH 2 CREW ACFT. AS PNF I WAS 1) ATTEMPTING TO MONITOR FO'S CTL OF THE ACFT; 2) PUTTING ON OXYGEN MASK; 3) NOTIFYING TWR -- DECLARING EMER; 4) ACCOMPLISHING APPROPRIATE CHKLIST -- HEAD DOWN READING IN COCKPIT; 5) RESPONDING TO FO REQUESTS FOR GEAR UP; FLAPS; HDG AND ALT SELECTIONS ON MODE CTL PANEL. I FIND; IN RETROSPECT; THAT THE MONITORING FUNCTION WAS LOST EXCEPT FOR 'ARE WE RIGHT SIDE UP' CHKS ON OCCASION. SINCE THE FO WAS ALSO PUTTING HIS SMOKE EQUIP ON I'M SURE HE WAS DISTRACTED FROM FLYING THE ACFT. THE NICETIES SUCH AS GEAR SPD; FLAP SPDS; AIRSPACE RESTRICTIONS MAY OR MAY NOT HAVE BEEN ADHERED TO. WHILE NORMALLY; WITHOUT A PHYSICAL THREAT TO THE CREW (ACRID SMOKE); THESE AREAS WOULD HAVE BEEN MORE CLOSELY MONITORED. IN THIS CASE OUR OVERWHELMING CONCERN WAS TO RETURN AND LAND. IN A PREVIOUS SIT SUCH AS THIS WITH A FE ON BOARD; I FOUND MYSELF ABLE TO MONITOR COMPLETELY; AS THE SYS WERE HANDLED BY THE FE. ENG OUT SITS; ETC; ARE CUT AND DRY. PHYSICAL THREAT SITS COMPLICATE THE MATTER. FLT LASTED A TOTAL OF 9 MINS. NO CARGO FIRE FOUND. MAINT HAD WORKED ON A BOROSCOPE HOLE AND HAD EVIDENTLY LEFT A POOL OF OIL IN THE ENG THAT TURNED TO SMOKE AND FILLED THE ACFT THROUGH THE BLEED/PACK SYS. OLDER ACFT COMPLETELY ISOLATED THE ENVIRONMENTAL SYS FROM THE ENGS BY USING TURBOCOMPRESSORS. MAYBE WE SHELVED A GOOD IDEA; IT WOULD HAVE PREVENTED THIS PROB.