A version of the vaporizer has been used for a long time. The old school version of the vaporizer was called a Hookah. I'm sure a few of you have heard of it.
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A Hookah is used to smoke sheesha, or a flavored tobacco.
You smoke it by adding water to the bottom of the hookah, and a piece of burning charcoal on the top, on top of a piece of coil, to heat the sheesha.
You smoke by sucking through a long tube connected at the middle of the hookah.
As you suck through the hose the smoke is drawn through the water and out the hose
Again, vaporizers are just modern and more technical versions of a hookah.
For more information check out Hookah Company