The lungs don’t get used to the smoke, it’s just that there’s not a very high concentration of smoke from the cigarette when you breathe in. The bigger thing is that your body recognizes the ash particles / the smoke when you try to breathe it in, and that can force you to cough the first few times, but eventually you get over that.
> and can they then handle inhaling all smoke (e.g. fire)?
Absolutely not. Cigar smoke is very thick and can cause a person to choke hard, and smoke from regular fires is also very thick.
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