Yep, smoke ring.
People who've never seen a good one don't understand just how stable, perfectly circular, and long-lived a strong ring vortex can be.
They hold together so well, there was thoughts of using them as an anti-aircraft weapon during WWII. Ring vortexes hold together amazingly well, but not that well, and it was found that to make a ring vortex big enough and moving fast enough to even bother an aircraft at altitude, much less snap it's wings off, you'd need explosives or fuel-air mixtures and gigantic combustion chambers that made conventional artillery much more efficient.
There are toy versions and they shoot amazingly far.
Toy vortex gun...
There was a toy "bazooka" that used the principle to knock over paper buildings and plastic army men sold in the late 50's or early 60's but it was eventually pulled for fear of busting kids eardrums at point-blank range.