The 23-year-old British singer has been forced to cancel her US tour for the second time after suffering a vocal-chord haemorrhage following a bout of laryngitis, but said that it is a result of her non-stop chatter.
'Smoking is not the reason I got laryngitis – it was because I was talking too much,' she told The Sun.
'I damage my voice offstage, not onstage.
'Onstage I am fine as apparently I am technically great, but when I talk I damage my voice big time. I have got screwed into giving up smoking.
'If I wasn't a singer I still would be smoking 25 a day. Smoking is my favourite thing to do in the world, I am gutted I have had to give up.
'But I have been tough – no patches, no gum, no hypnotism. It f****** sucks.'