Holidaymakers onboard a Boeing 757 flight were led to safety after the plane made an emergency landing at Stansted Airport.
The plane was evacuated using an emergency chute
The 154 passengers and seven crew had been travelling with Thomson Holidays from Newcastle to Larnaca in Cyprus when the captain raised the alarm.
He said there was a misty haze inside the cockpit. The plane was evacuated at the airport using an emergency chute.
Investigations are now under way into what caused the problem.
A Thomson spokeswoman told the BBC a couple of people suffered minor friction burns from using the chute, but there were no major injuries.
She said a new plane was being prepared to take the passengers on to Cyprus.
"An alternative aircraft will depart from Stansted at 1650 to Larnaca," the spokeswoman said.
"Two passengers did not wish to travel and have gone back to Newcastle by taxi. They didn't feel comfortable with travelling."
She said having just two people travel back out of a "whole flight" showed that most people were happy with the "procedures" that were followed.
The Boeing 757-200 that made the emergency landing was still being examined by investigators, she added.
A spokesperson for Stansted Airport told BBC Essex there had been no disruption at the terminal and everything was running as normal.
Assistant divisional officer Mark Samuels, of the Essex Fire Service, said: "There is no sign of fire on the aircraft and we have been unable to find the source of the smoke.
"Fortunately the incident turned out to be a false alarm."
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