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Mean grayscale median value (+/− standard error) at baseline and year 3 for eventual abstainers (black line) and continued smokers (gray line). Eventual abstainers demonstrate a small change in mean GSM (−3.63 units) between baseline and year 3 imaging. There was a significant time*smoking status interaction in predicting the GSM value at year 3 (p=0.029). GSM = grayscale median
