What was found
DURING DECENT, BELOW 16000 FT, THERE WAS A STRONG CIGARETTE LIKE SMELL EMITTING FROM AN UNKNOWN SOURCE. NO SMOKE WAS VISIBLE. THE ODOR DISSIPATED AFTER TAXI-IN. DURING DEBRIEF, CREW NOTED APU WAS NOT OPERATION DURING EVENT. INSPECTED THE FWD EQUIPMENT BAY, NO DEFECTS OBSERVED. INSPECTED THE AIR CONDITIONING BAYS FOR ANY SIGNS OF CONTAMINATION, NO DEFECTS OBSERVED. PERFORMED DUAL ENGINE RUNS IAW JRH CH5 WITH BOTH PACKS IN OPERATION, IN BOTH AUTO AND STBY-N POSITIONS THROUGH TEMPERATURE RANGE, NO SMELLS OR DEFECTS NOTED. OK FOR SERVICE.