Fig. 2

Sankey diagram of change in smoking behavior. The diagram shows smoking behavior broken down into two categories (smoking and non-smoking) at three time points (T0, T1, and T2). The paths show the proportion of individuals changing or not changing smoking behavior across the time points. The width of each path represents the proportion of individuals who change categories. The colors highlight the different categories of smoking: orange (T0/T1) and red (T2) are used to represent smoking and green non-smoking, respectively. At both follow-up points, more people had stopped smoking than started smoking. Non-smoking increased from T0 to T1 (7,582 to 7,614) and from T1 to T2 (7,614 to 7,644). Smoking decreased accordingly, from T0 to T1 (699 to 667) and from T1 to T2 (667 to 637)