Assessment of smoking behaviour in a dental setting: a 1-year follow-up study using self-reported questionnaire data and exhaled carbon monoxide levels
Brügger, Odette ; Frei, Marc ; Sendi, Pedram ; Reichart, Peter ; Ramseier, Christoph ; Bornstein, Michael
In: Clinical Oral Investigations, 2014, vol. 18, no. 3, p. 909-915
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- Objectives: This study analyses the changes in smoking habits over the course of 1year in a group of patients referred to an oral medicine unit. Materials and methods: Smoking history and behaviour were analysed at baseline and after 1year based on a self-reported questionnaire and on exhaled carbon monoxide levels [in parts per million (ppm)]. During the initial examination, all smokers underwent tobacco use prevention and cessation counselling. Results: Of the initial group of 121 patients, 98 were examined at the follow-up visit. At the baseline examination, 33 patients (33.67%) indicated that they were current smokers. One year later, 14 patients (42.24% out of the 33 smokers of the initial examination) indicated that they had attempted to stop smoking at least once over the follow-up period and 15.15% (5 patients) had quit smoking. The mean number of cigarettes smoked per day by current smokers decreased from 13.10 to 12.18 (p = 0.04). The exhaled CO level measurements showed very good correlation with a Spearman's coefficient 0.9880 for the initial visit, and 0.9909 for the follow-up examination. For current smokers, the consumption of one additional cigarette per day elevated the CO measurements by 0.77ppm (p < 0.0001) at the baseline examination and by 0.84ppm (p < 0.0001) at the 1-year follow-up. Conclusions: In oral health care, where smoking cessation is an important aspect of the treatment strategy, the measurement of exhaled carbon monoxide shows a very good correlation with a self-reported smoking habit. Clinical relevance: Measurement of exhaled carbon monoxide is a non-invasive, simple and objective measurement technique for documenting and monitoring smoking cessation and reduction.