Congrats! I quit smoking 11 years ago now, i was smoking a bit more than half a pack a day. I went cold turkey too, originally more as an experiment. (I wanted to feel how some of everyday actions were not driven by my decision and choices but by habits or physical need). In the end it was so benificial in just 2 weeks that i never smoked again. Now i can't stand smoke at all. It takes a while for some of the associative habits to go away though (like while drinking in a party, this kind of thing). I would advise to never tell yourself that you can smoke a cigarette once in a while. I don't know anybody who stopped and didn't go back to full time smoking after smoking a cigarette once in a while for a few months.

I also noticed that it's important to involve smokers around you so that they don't offer you cigarettes. I also noticed a type of smokers who try to get me back to smoking. I found that doing stuff like destroying their cigarette pack when they try to have you get one with insistance was the best way to stop that.