EntityQ2133102· pop 8· linked from 31 articlessmoke ringSign in to savevisible vortex ring formed by smoke in a clear atmosphereConnectionsWorld War IIConceptfireEntityMount EtnaEntitysmokeEntityartilleryEntitycombustionEntitycondensationEntityincenseEntityTimes SquareEntitylighterEntityelectronic cigaretteEntitysmokingEntitymushroom cloudEntityABC NewsEntityvortex ringEntityair vortex cannonEntitybubble ringEntityHotel ClaridgeEntityCategoriesSmokeSmokingVortices