Another ad shows Terrie, 52, who was diagnosed at 40 with oral and throat cancers and had her larynx removed.

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However, most studies focused on lung cancer the most common smoking-related cancer and few examined the association with esophageal cancer or cancers of the mouth and larynx.

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The cancers were those of the lung, throat, mouth and larynx.

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Patients who have undergone cardiac surgery are also at risk for damage to their voice since the nerves that control the larynx are located near the heart.

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The court heard during the trial she was only able to mouth answers to police and write details on a notepad because of injuries to her larynx.

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There is also the "vocal tract" - everything upwards of the larynx along with the mouth, which are well known in humans to shape sung notes and subtle vowel sounds.

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Another potential cause is muscle tension dysphonia, which occurs when the muscles around the larynx, or voice box, are too tight and causes a person to use excess tension while speaking.

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He said when I say flipping heck the phone lines are jammed, I don't need to hear this kind of language, disgusting Jack Russel but when I use quite appalling language it's great, it's funny so the thing is to have a larynx made of tweed and you can get away with anything.

BBC