Secondhand cigarette smoke is well known to be toxic. Let's illegalize cigarette smoking in bus shelters, and require smokers to smoke 25 feet from any bus shelter.
Why is this important?
Maybe you've been there: You're sitting in a bus shelter -- the kinds with seats and roof, sometimes even walls -- and someone else lights up a cigarette. You get to inhale their secondhand smoke, even when it lingers after they've put it out. They tell you they have every right to smoke inside a bus shelter. Maybe they have so far, but we can change that, and have them step far enough away from the shelter that we won't be breathing their secondhand smoke even after they put the cigarette out, we won't still be breathing that smoke.