Just got back this weekend and wanted to file a field report. I vaped all over the grounds and in pretty much every venue during our two days at the Open. Nobody even so much as looked at me cross-eyed. Now, I don't blow clouds and use the tootlepuffer Ego Twist kind of setup, but still there were some exhaled visible vapors and no one said anything. I did see one guy leaning up against a wall, using a box mod and blowing bigger clouds, but I think it's safe to say the US Open is either vape friendly or just hasn't gotten around to banning it yet. They did repeatedly say there is no smoking allowed on the grounds but vaping seems to be okay for now. In addition, I vaped openly in the Long Island railroad terminal, on the train itself and Amtrak both 2 and from NYC. It was great not to be hassled. Hopefully this will continue to be the normal. It made for a much more pleasant experience.