As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN THE INITIAL CLIMB, HAZE DEVELOPED IN THE CABIN, PROMPTING THE CREW TO LEVEL OFF AT 1800 FEET AND RETURN TO DEPARTURE AIRPORT. BY THE TIME THE AIRCRAFT TOUCHED DOWN, HAZE HAD DISSIPATED. RESPONDING EMERGENCY SERVICES FOUND NO TRACE OF FIRE, HEAT OR SMOKE.