Smoking during pregnancy

EDIT: Thanks for your replies, makes me feel a lot better!

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I quit smoking the day I found out I was pregnant, (had 10 per day) which was about 8 weeks ago, I’ve used my vape here and there...

I was doing great, then I started having dreams every night the past week or 2 about smoking and I couldn’t get it out of my head.

Well, I had one 3 days ago and it seemed to stop the dreams. I’ve had half a cigarette each day since and today I’ve had a whole one.

I’m so worried and I feel like the worst person in the world right now.

Does anyone have any similar stories or any help please?