Perhaps you would benefit from creating the half-habit of not smoking. My mother-in-law put three cigarettes in an ashtray every morning, and for every one she didn’t smoke at the end of the day, she took a dollar out of her wallet and put it in a jar. Each time she went to reach for a cigarette, she made note of why she wanted it, when she wanted it, etc. to see if there were triggers, and worked on those. In her case, she usually smoked while she was on the phone with my sister-in-law. If you quit smoking cold turkey, it seems to take about 30 days for it to kick in. It is okay to be irritable.