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how to blow a smoke ring

Because air does have friction, the outer service moves backward while the inner stream moves forward.

Don’t exhale. Less tongue. Your mouth is now a vortex cannon.
Explanations regarding the science of smoke rings might confuse you with complicated talk of “vortices” and “fluid dynamics,” but the more simple explanation has everything to do with smoke itself, which is a collection of tiny solid, liquid, and gas particles.

GQ once broke down the Vape God’s own method like this: “an opaque, well-formed O requires a sharp, percussive cough that emanates from deep within your diaphragm, like a kick pedal hitting a drum.” Part of the trick is to pull your tongue back and keep the tip down, to cradle the blast of air that you’ll shoot out.
The ring should come from your throat and not your lungs. Think of it more like a cough rather than a full exhale, because you need an independent burst of air rather than a continuous stream. That’s why you might see some vape tricksters use their hands to push vape rings forward, which helps provide the momentum for the ring to keep its form.
Now check it out in motion, and in slow motion:
Science Hobbyist utilizes the following visualization to make sense of what’s happening with a smoke ring, which is why we see it twist backward in all the vape videos out there:
You can make your mouth into the roundest O possible and exhale in short bursts, but it probably won’t do you any good. Much like swimming, it’s really hard to teach someone how to blow smoke rings until all at once, intuition kicks in and everything just clicks.

According to Science Hobbyist, on average no air is actually moving as the smoke ring appears to move through the air. Anything that moves through the air has to push air out of the way, including other air or smoke. In frictionless air, a smoke ring might never lose it shape, but vaping in such conditions is pretty much impossible.

Don’t exhale. Less tongue. Your mouth is now a vortex cannon.