Why do cigarettes and cigars suddenly make me sick?

I'm fine with it, neither are good for you. But it's curious to me. I always liked the smell as a kid and had started smoking a lot for a few months, then only a couple times a month. (Cigars were over the years a treat id spread over a month or two)

One day I was smoking a cigarette and the smell, it made me so sick. I felt like I'd vomit. I stopped, but when I tried again it happened again later. If I walked by someone smoking it was all I could do not to vomit. What would suddenly cause this?

Why do cigarettes and cigars suddenly make me sick?
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