I don't know who else loves doing this but I do it all the time.
Today though is different, for some reason I had the bright idea to change my technique. Choose a dense juice that would be choice for vapor rings (RY4 for me). Make a circle with your mouth like a fish and lightly tap your left or right cheek. Bam! perfect vapor rings every time! Dense ones too! You can even make a beat with your left and right cheek if you always have music in your head like me. I've been trying to get smoke rings to go inside one another like a dartboard. See if you can do that.
Vapor rings are probably the coolest smoke/vape trick to date.
haha...used to that when i smoked...