Too often, "I can do it" gets buried by "I can't do it."
This is the battle with yourself.
This is where you need to hear yourself say the positive, not, the negative to talk yourself out of smoking instead of into it.
What do you think will happen if you keep telling yourself you need a cigarette?
I suggest you repeat a simple phrase every time you get the thought of smoking.
"I don't do that anymore."
There is no battle when you accept that you are quitting smoking.
Willingness not Willpower