Is we are REPETITIVE beings.
Look at food as one example.
We learn seasonal likes for certain foods from our family.
Often at those times each year those foods are recreated by us long after those people are gone because it is familiar. It's also seasonal based on fruits and vegetables available. People make apple pies in the Fall. Cherry pies in the Spring. All these memories and connections make us who we are and influence our behavior.
I remember my dad having smoked sardines and saltines in the Spring and buttermilk in the summer.
REPETITION IS COMFORTING BECAUSE IT'S FAMILIAR.
THAT'S WHY WE DO IT.
I would imagine our smoking cues begin in much the same way and deepen the longer we smoke,
the unexpected amount of time it takes to unlearn it.