Substance smoking (was it opium). I think there's a black girl who smokes a cigar with her vagina as well :-)
"She rarely smokes while performing, but does indulge in an opium pipe along with several other people. The really hot scene in this movie is a fully nude erotic dancer, an Asian girl, who, as part of her dance, places an unlit cigarette in her vagina, lights it with a second cigarette, and inhales smoke with her vagina three times, blowing long, thick plumes of smoke into the air.
Other references to this movie:
Sylvia Kristel - Picture - holding, Emmanuelle (1974)
VHS
VHS
VHS
VHS
, Allposters.com