Do people who quit smoking become angry because of nicotine withdrawl, or where they always angry only ciggarettes helped them put a lid on it?

As some of you know, I have quit smoking. This is week 3 and so far so good.
I have stopped yearning every 5 seconds and I’ve actually been pretty good at not being cranky or anything like that.
But I’ve feel I’ve discovered something. Yesterday I got pretty irrate at the fact that I had a postal money order that I couldn’t cash anywhere.
And depositing it in my bank was out of the question because it was clear across town and the PO. was close. Its not that I needed the money then and there, I was just irrate that no one would cash it, even in exchange for goods.
I had proper ID and so on. Anyhow. I was so pissed off that I wanted a ciggarette so bad. Some of them I felt where straight up lying because they simply didn’t want to go through the trouble of dealing with the check.
Anyhow, I had a really hard time dealing with my discust with the vendors. In the past I would’ve simply had a ciggarette and move on with little to no stress over something so trivial.
Only this time I didn’t have a ciggarette to stuff down my discust.
I realize that I often would take aggrevation and just puff it away on a ciggarette and put it behind me. That was how I choked down stress.

So it got me wondering. Is it that smokers never really learn to cope with stress that makes it seem that they get cranky all of a sudden over little issues?
Curious to hear from smokers and former smokers.