who only by moving can balance

You'd like my old uni. They have a fairly discrete campus (as in, there's a wedge of land with nothing but uni buildings / parks / facilities on it) and in 2010 put in a rule that instead of having designated no-smoking zones there would be a handful of designated *smoking* zones and the rest of the uni is smoke-free. Actual obedience to this rule varies - people smoke on lawns that are not the official smoking lawn - but generally paths and forecourts are safe.