Firefighters are urging people to make sure they put out their cigarettes properly after a flat fire in Holloway.
Crews were called to Cornwallis Square just before 6.55am yesterday after a blaze damaged a room in a first floor property.
Fire investigators believe it was caused by a cigarette.
A London Fire Brigade spokesperson said: "If you smoke it is vitally important you stub it right out, preferably in an ashtray.
"Always ensure your cigarette is completely out when you've finished smoking it. If you don't, you risk causing a fire as you don't know what it may land on which could potentially start a fire."
The fire was under control in an hour. Crews from Holloway, Kentish Town, Islington and Hornsey attended.
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