This is from the "The Giant Book of Sneaky Feats"
1. Draw enough smoke to fill your mouth. Try to keep it toward the back of you mouth so it won't escape until you wnat it to.
2. Purse your lips into a tiny, perfectly round O. Rest your tounge lightly on the floor of your mouth. Keep all muscles relaxed.
3. Without changing the shape of the O, increase it size by pulling your upper lip tightly against your upper teeth and dropping your lowe jaw slightly. The O at this stage should be about in inch in diameter.
4. Push out the ring by gently flicking your tounge. The back of the tounge is what does the trick; at no time should your stick your tongue out of your mouth. Each mouthful of smoke yields four of five puffy smoke rings. Pause briefly between rings so that one air-current doesn't interfere with the next.
Another fun thing to do with smoke... Blow smoke bubbles [:)]. Go the toy store, and get a bottle of bubbles, and a straw. Draw enough smoke to fill your mouth. Dip straw in the bubble solution, and blow a bubble through the straw filled with smoke.
Really fun popping them [:)]