The way I view it is fairly simple: the things you list involve planning. Willpower is how you react in the moment.
You could phrase it like this: the willpower to resist going out and getting cigarettes is much easier to perform than the willpower to not grab a cigarette that's in front of you.
However "will power to resist going to the store" isn't really utilizing will power to stop smoking, it's having an effective strategy that relies on knowing how hard it will be for your future self to actually employ that will power if the cigarettes do reach your desk.
You could phrase it like this: the willpower to resist going out and getting cigarettes is much easier to perform than the willpower to not grab a cigarette that's in front of you.
However "will power to resist going to the store" isn't really utilizing will power to stop smoking, it's having an effective strategy that relies on knowing how hard it will be for your future self to actually employ that will power if the cigarettes do reach your desk.