I ride the DC Metro to work. Sometimes people sit next to me who smell like pot. I don’t care if they do, and there’s no way in hell I’m going to report them… not for that, anyway. Still, I dress conservatively, and I don’t want them on edge about it. I want to signal “it’s cool, I don’t care.” Is there a hand gesture? A small, tasteful lapel pin? Those I’ve seen are either tacky or only about medical marijuana. And scrawling pot leaves in my copy of F. A. Hayek’s The Constitution of Liberty, just casually where they can see it, strikes me as inappropriate somehow.