Suppose You Had a Pressure Cooker Filled with Wine and a Long Hose Running Into A Tent... Put the Pressure Cooker on the Campfire and...

The Alcohol will Evaporate and Fill the Tent with Intoxicating  Vapors and Hot Steam... Like a Sweat Lodge but With Booze... Might be Useful to Heat the Tent just before Bedtime... 

Of Course you could fill the Pressure Cooker with Coffee, Tea or Water and Marijuana Leaves... Beef Stew... anything!

If You Filled it with Vodka AND Marijuana Leaves The Alcohol would act as a Different Solvent Than The Water... Releasing Different Chemicals...

 Click on the Pictures to See them Bigger.

A Drawing of a Pressure Cooker Tent Vaporizor
Done on a Map of California by gvan42

Pen Drawing on a Map of UTAH