cigarette smoking articles The AMA-Tobacco Industry Research Collaboration – The Center for the Study of Tobacco and Society Smoking: Effects, Risks, Diseases, Quitting

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We verified the final models for error specification, normality, homoscedasticity, multicollinearity, outliers and self-correlation, and all diagnostics showed that the chosen models fulfilled the assumption [see Additional file 1] Discussion This is the first study on smoking behavior in a Spanish adult population using both a questionnaire and a biomarker of tobacco exposure