Perhaps the only thing, despite what the commercials say, that does look cool when you are smoking. This is a small circle of smoke created by carefully blowing smoke out using a time-tested method. (see: How to Blow Smoke Rings) The ultimate smoke ring is blowing one large one, and then a smaller one through the middle of the first.

And no, even though I have tried very hard, it is impossible to blow smoke letters like the tripped-out, hookah-smoking caterpillar in Alice in Wonderland.