What was found
THE CREW REPORTED THAT THEY HAD CABIN AND COCKPIT SMOKE IN FLIGHT FOR ABOUT 2 MINUTES COMING FROM AIR CONDITIONING VENTS, THE SMOKE WAS VISIBLE AND ODOR STRONG AND NOTICEABLE. THE ACFT LANDED WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE ACFT AND PLACED THE BLEEDS ON MEL 36-11-05-1 AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE. MAINTENANCE INSPECTED THE ACFT, PERFORMED FIM 72-00-00-990-086 WITH NO DEFECTS; FOUND A BLEED TUBE DISCONNECTED FROM HE NR 1 RECIRC FAN CAUSING "FOGGY AIR" IN THE CABIN, THE DUCT WAS RECONNECTED, OPS CHECKS PERFORMED WITH NO DEFECTS NOTED, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.