Blowtube

A blowtube is a device used to mask the odor of exhaled marijuana smoke. It is fashioned by inserting crumpled dryer sheets into an empty cardboard tube, generally an empty toilet paper roll.
Michael McClure is credited with the creation of the first extant blowtube found in Central Illinois in 1984. Since this initial discovery, artifacts have been found spread across the country with fanciful adornments and multi-directional tubing.
 
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