increase the velocity of the compressed air upon exit... annular vortex distance is related to escape velocity and volume 
Work on the aperture of your mouth. Press your lips tight around your teeth, move the air quickly and stop it quickly. Think of it like throwing darts with your air; a quick snap from your diaphragm to start your cough, then quickly stop the air without disrupting the shape of your mouth. Most of all, lots and lots of practice.
Keep vaping bro!
You forgot about the velocity maximizing, flat-brimmed, trucker hat.
Smoke Rings?
With Vaping there is nothing burning and hence no smoke so maybe I am being critical but shouldn't the correct terminology be used? Vapor rings? Mist rings?
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First go like this, spin around. Stop! Double take three times: one, two, three. Theeeen PELVIC THRUST! Whoooo! Whooooooo! Stop on your right foot, DON'T FORGET IT! Now its time to bring it around town. Bring-it-a-round-town. Then you do this, then this, and this, and that, and-this-and-that-and-this-and-that, and then...View attachment 534075
LOL........
You can either blow a decent smoke ring or you cannot. It's hard to teach.
Ol sponge Bob....my kid loved that lil fellaFirst go like this, spin around. Stop! Double take three times: one, two, three. Theeeen PELVIC THRUST! Whoooo! Whooooooo! Stop on your right foot, DON'T FORGET IT! Now its time to bring it around town. Bring-it-a-round-town. Then you do this, then this, and this, and that, and-this-and-that-and-this-and-that, and then...View attachment 534075
Now you have to try the one nostril trickNow because of this thread I am sitting here blowing a vape ring and shooting 2-3 through the first one~! All of the tricks from the cancer sticks are like riding a bike you never forget how.
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ROTFLMFAO!First go like this, spin around. Stop! Double take three times: one, two, three. Theeeen PELVIC THRUST! Whoooo! Whooooooo! Stop on your right foot, DON'T FORGET IT! Now its time to bring it around town. Bring-it-a-round-town. Then you do this, then this, and this, and that, and-this-and-that-and-this-and-that, and then...View attachment 534075