You probably did but seeing as how we have one of THE STATE OF THE ART ventilation systems, unless you're actually ALLERGIC to tobacco smoke it won't bother you.
Sometimes if I am in a mood, just before I enter a store I will take a deep drag, put out my cigarette, go inside as far as I can hold it. . . and exhale. Best as I can tell that's legal.
BTW. . . here in Houston non-smoking establishments (pretty much any place) are supposed to provide an ash can at the entrance. Most of them don't. Get shoddy service? Turn 'em in to the smoking police!