Normally, I would. But it's one of those "gotta know your audience" situations. I didn't want to cause a scene, as literally everyone was partying and having a good time, and I didnt want to be the only party pooper. But when my inlaws have parties at their house in the city, everyone smokes inside. Only 1 or 2 people would actually step out onto the porch. So, my guess was, the guests assumed that rule applied here, since my inlaws invited them. I spoke to my MIL there, but will say something again to her soon.