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Methylation development after quitting. Boxplots showing the methylation extent at baseline and follow-up for individuals in the Current-Former group (interim quitters). Individuals were stratified in six groups based on median age at baseline (54 y) and smoking intensity tertiles at baseline (< 11 cigarettes per day, 11-17 cigarettes per day, and > 17 cigarettes per day). Extent of methylation is shown on the y-axis in percentage points.
