There was also a tendency to do so if the patient was a current smoker, reported elevated levels of smoking and/or had a concurrent alcohol problem (123, 124)
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Smoking causes or can lead to: many types of cancer including lung, mouth, throat, voice box, bladder, bowel, cervix, kidney, liver, stomach leukaemia heart disease blood pressure problems stroke fertility problems serious breathing conditions weak bones It also has unpleasant side-effects such as wrinkles, smelly clothes and hair and bad breath
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As the name suggests, they are small (less than 1 cm in diameter)
In some cases, the discoloration might even look like dark spots or patches