In California, it's "live and let live", unfortunately, when it comes to neighbors.
That's right but... in this case, i'd say she doesn't "let live". I mean, what if she was "chain smoking" the weed (btw, how many "arms" does this "chain" have? three? five? more?! and hey, leaving burning butts is somehow beyond my understanding - let's face it, snubbing out takes a few seconds)? Or making p##p collection in her backyard?
My Aunt gave up smoking a few years ago and is now sort of allergic to smoke, and neighbours started smokin' right next to her apartment's door; moreover, those were cheapest RU cigs. She said she was suffocating. "Live and let live", right, but she talked them into stopping that & finding the other place (they don't smoke in their own apartment, BTW, because they have a young kid).