I wouldn't count on any sports venue to accept plumes of vapor floating around your face. LOL I've heard of people who've been told to "stop smoking" and they didn't win the argument with it being vapor.
I stealth vaped in Chase field watching the D-backs. Just held it in, and blew our any vapor low to my lap or into a drink/straw. My next door neighbor seat mate didn't bat an eyelash, but did side glance me a few times. Nic buzz, hot dogs, beer and summer baseball with my hubby. Ahhhhh.