Yes, it's funny how everyone here is talking about the chemical addiction only.

That is a thing, but there's also the habits you formed over the years. And they can be worse than the chemical craving.

I've greatly reduced my smoking multiple times for days up to a week. And then I forgot one morning and went back to my usual intake. Once I even stopped smoking for 3 days but forgot the 4th and lit one.

You need a plan for the reflexes you've formed too.