Airzooka. Grip the Airzooka handle with one hand, and pull back the elastic membrane with the other hand. Aim and release the membrane. The vortex created by the Airzooka is generally too fast moving to make a stable smoke ring. However, the blast can be felt up to 30 feet away. With enough practice and gentle touch, a ring can be produced. FLUID DYNAMICS.
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This is a fun toy but make sure people are careful with it and don't pull past the limit of tolerance. I've already fixed this once! One potential mini-investigation that could be done with it is to vary the distance of the airzooka and try to quantify how much the strength decreases (say by how much their hair is lifted by the puff). As always when you present a demo make sure you ask the participants questions before you demonstrate and after. Think about the concepts involved beforehand; having a friend ask you questions about it can be very revealing as to if you understand it well or not. Whenever you ask a question count to five (or at least three) in your head waiting for an answer before you stay anything else.