The fake-period effects are not exactly zero (averaging about -6.0 packs), reflecting the reduced pre-treatment fit when the training window is shortened from 9 years (19801988) to 5 years (19801984)
However, there still may be some bias (toward a positive association) from including all smoking status groups in the same model, especially if there is an unaccounted-for interactive effect between EC use and smoking history (such that those with longer smoking histories have higher health risks) which could falsely appear to carry over to PWNS
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Psychosocial support involves cognitive-behavior therapy (CBT) strategies to target identifying smoking cues, breaking the link between smoking and these cues, and learning alternative coping mechanisms