Baseline characteristics by presence of a tobacco stain on fingers.

* Chi-squared test or the Fisher exact test † Wilcoxon rank sum test ‡ Number of packs smoked in a day multiplied by the number of years spent smoking or sum of the different PYs throughout life if the consumption was higher or lower for more than a year’s duration. § Vascular disease is composed from any of ischemic heart disease, stroke, or peripheral vascular disease. || Harmful alcohol use: high alcohol intake associated with documented withdrawal or medical consequences. IQR: interquartile range 25–75% Baseline characteristics by presence of a tobacco stain on fingers.