Here is a tiny smoke machine that you can use for photography, cosplay, and everything in between. The Costronica Pocket Smoke is powered by 3 x AAA batteries. You can use Propylene Glycol or Glycerine to refill this. The device uses a 1 meter tube to guide the smoke where you want.
More gadgets like this: here
While you can run this continuously, it is recommended that you give it a break for cooling off to prolong coil life.
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