See the full experiment here:
You've seen Steve use a giant smoke ring launcher made from a modified trash can, but there's a way you can construct a smaller version at home! Using an empty coffee container and a smoke bomb, you'll be creating swirling vortexes of smoke in under 10 minutes. In addition to the awesome smoke ring launcher you'll have, you will also gain a new understanding of the movement of air and vortexes!
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