Whilst it looks very intriguing, it's a smoke ring believe it or not. There are smoke rings given off by a model volcano at that Virginia theme park, which hang around for quite some time. I only know this because someone posted a video on YouTube recently and I followed the comments on it. The poster eventually conceded this is what it is. It is very unusual for it to stay around for so long, but imo that's what it is.
Good to see you back, keep posting
