Mesmerizing smoke circle art

Remember when I was a child, B.H. liked to watch the smoke rings that my father blew out when he smoked (take a deep puff of smoke, purse his lips into an O shape, then gently flick his cheek with his fingers while exhaling. This way, small round smoke rings would appear). Who would've thought that the photographer of this piece also had a similar hobby - manipulating the smoke into rough shapes and then photographing them. Who says this isn't a small art form in life? (P.S. Don't know what camera was used, but it managed to capture such a beautiful effect.)