Can't say I ever did that but I expect perhaps it's just part of your quitting process to study in some depth that you never did before just what goes on when someone is smoking a cigarette. I bet you never even thought about it before when you were a smoker so now you're curious to examine precisely what happens when someone smokes. I doubt this will last long. Your curiosity will lessen and I expect you'll look at smokers differently in future.
I remember my relationship with others smoking went through a couple of phases. Initially, I wasn't around any smokers as I quit in the dead of winter so being outdoors around people smoking h=just wasn't a part of those first two or three months for me. Then came the short phase where I noticed I could smell someone smoking from a distance, which shocked me because I related it to myself and thought ... "Oh my God! Did I really smell that badly to others around me who didn't smoke?" Then, about 7 months into my quit, we went to Vegas for a few days and of course everyone seems to be smoking there. That's when I began looking at smokers around me with pitty and that was the exact moment I KNEW I would never smoke again! It was at that moment I realized what a slave I'd been to my need for nicotine - just like these people I was watching who just had to have a smoke even when they were in the outdoor pool
Now, I look at smokers with some level of distain like ... Oh my, get away from me please. That's so disgusting. I suppose Ive lost all patience with somkers which I shouldn't because I uderstand deep down just what it was like to be an addict completely oblivious to how others around me were affected by my disgusting habit.
As I said earlier, I expect what you're going through is part of your divorce from smoking. Examining the whole process in a way you never did before. I think it's probably a good thing overall.