The “smoke” from vapes is propylene glycol and glycerin. The vapes with lots of “smoke” have a lot of glycerin in the solution.
Bigclivedotcom has a few videos on how smoke machines and vapes work.
[Here is a video of how smoke machines and vapes work](https://www.youtube.com/watch?v=H5QtGerJ_tI) this is quite a long video.
Vapes and smoke machines use the same technology, vapes are just smaller.
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