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I never understood why people would use this type of apparatus when an electronic temperature controlled version is so easy to make
For example, you can easily modify a hairdryer into one such device..
What do you do during a power outage?
;D
It doesn't work like a hair dryer, because to heat ---green stuffs--- it does not require 1000watts.
You need something around 10-20 watts tops..
So you can easily get that with some lithium batteries...
With a small battery bank, like those 3 cell chargers, you can power a converted hair dryer/ vaporizer for at least 2-3 sessions.