Narrative:

Before takeoff in chicago, while still at the gate a smoke detector went off in one of the lavatories. Maintenance disabled the alarm. As we took off, the alarms in 3 more lavatories started going off. Then a smokey haze filled the cabin. The pilots immediately went back to land. We prepared for landing but didn't go through our emergency checklist, to prevent passenger from panicking. We landed without incident as the smoke had dissipated.

Google
 

Original NASA ASRS Text

Title: CABIN ATTENDANT RPT REGARDING SMOKE ALARMS IN THE LAVATORY ACTIVATING ON TKOF. SMOKE THEN FILLED THE CABIN. RETURN LAND. A300 AIRBUS.

Narrative: BEFORE TKOF IN CHICAGO, WHILE STILL AT THE GATE A SMOKE DETECTOR WENT OFF IN ONE OF THE LAVATORIES. MAINT DISABLED THE ALARM. AS WE TOOK OFF, THE ALARMS IN 3 MORE LAVATORIES STARTED GOING OFF. THEN A SMOKEY HAZE FILLED THE CABIN. THE PLTS IMMEDIATELY WENT BACK TO LAND. WE PREPARED FOR LNDG BUT DIDN'T GO THROUGH OUR EMER CHKLIST, TO PREVENT PAX FROM PANICKING. WE LANDED WITHOUT INCIDENT AS THE SMOKE HAD DISSIPATED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.