When you smoke in an enclosed area(Car, SAUNA, Tent, small room) and the smoke stays in the area and you are contnuously breathing in smoke... the purpose is to FUCK YOU UP! Have fun.
Smoking cannabis/marijuana in smallish inclosed space causing the smoke to fill the room and be reinhaled.the room often starts to heat up during the procces.Often done more by high/college students then older smokers.
Although many belive hotboxing gets you more high this is untrue.The active ingrediant in marijuana is THC. When you inhale the THC is absorbed by the aveoli in the first 3-5 seconds. Some say they get more high in a hot box this is a plucibo effect.