MD80 CREW HAD SMOKE IN THE CABIN AFTER TKOF AT DFW.

Narrative

AS THE ACFT WAS CLBING; ALL OF THE FLT ATTENDANTS (3) NOTICED SMOKE BILLOWING THROUGHOUT THE WHOLE ACFT -- NOT JUST THE COCKPIT. IT SEEMED TO BE COMING THROUGH THE VENTS. WE WERE STILL IN STERILE; SO WE ONLY GOT UP TO MAKE SURE THE PAX WERE OK. THE CAUSE OF THE SMOKE WAS UNKNOWN. WE WERE ADVISED BEFORE TKOF THE ACFT WAS IN THE HANGAR FOR 2 DAYS PRIOR TO THIS TRIP FOR SMOKE IN THE PLANE DUE TO THE APU; WHICH WAS SUPPOSEDLY CHANGED. THE CAPT ADVISED US WE WEREN'T GOING TO DO AN EVAC; THAT HE TURNED ALL THE PWR OFF IN THE ACFT AND THAT WE WERE GOING BACK TO DFW. ANNOUNCEMENTS WERE MADE TO CALM PAX AND TO REASSURE THEM EVERYTHING WAS OK. IT SEEMS LIKE THIS PLANE WAS NOT TAKEN FOR A TEST RIDE BEFORE WE TOOK IT OUT. THE SMOKE WAS THICK WITH A GRAY/BLUE COLOR. IT SEEMED CRYSTAL-LIKE AS WE BREATHED IT IN. IT MADE US VERY DRY AND THIRSTY. MY THOUGHTS WERE THAT IT WASN'T FROM FLAMES; BUT MAYBE OLD DEICING FLUID HAD DRIED UP ON THE ACFT WHILE IN THE HANGAR. AS THE ACFT BECAME HOTTER; THE FUMES CAME THROUGH THE VENTS. I'VE WORKED ON THE RAMP AND I KNOW THIS IS VERY TOXIC. WE JUST NEED MORE DETAILED INSPECTIONS AND TEST RIDES TO PREVENT THESE INCIDENTS FROM HAPPENING AGAIN. I'M ALSO CONCERNED THAT THE LETTER FROM XXXX STATED IT WAS 'SMOKE IN THE COCKPIT INCIDENT FLT XXXX' WHEN THE SMOKE WAS COMPLETELY THROUGHOUT THE ENTIRE ACFT; WHICH WAS CLRLY EVIDENT TO THE PLTS.