First day on Treadmill

I am new at this, haven't been in a gym for like 10 years so bear with me.
I took on myself a 1 month challenge to run on the treadmill and tey to improve on that. My gym membership expires in a month anyway so I might make the most of it. Who knows, maybe I'll end up in foing gym for a long time.
I told myself I'll take a breake from smoking cigarettes, a couple of days, I have 3 years already 🤔