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The singer - who is suffering from a chest infection - was seen smoking throughout her show with Dizzee Rascal at the MEN Arena in Manchester.
The 24-year-old apologised for her off-key vocals, telling her fans that she had bronchitis.
According to Yahoo!, she said: "I've got a bout of bronchitis so sorry if my singing's a bit s**t. Not that it's any good anyway."
The 'Fear' singer was investigated by local authorities in Liverpool in December after she lit up during a performance, and was fined last year after smoking on stage in Paris.
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