A cigarette is thought to have started a fire in Doncaster flat early today.
The blaze started just before 1am at premises on Bentley Avenue, Hexthorpe.
The bedroom of the small, mid-terrace flat was filled with smoke but luckily the residents and people in neighbouring flats had already escaped safely.
Three fire crews used specialist equipment to help ventilate the bedroom.
A fire service spokesman said the flat was fitted with smoke alarms which went off when it started.