When one attendee — a 53-year-old filmmaker who lives in Cobble Hill — asked another partygoer for a light to spark one up, she instead pulled out a sleek hand-held contraption that looked like an oversize USB drive.

Turned out it was a Pax vaporizer, a high-tech gadget that has stormed the market for upscale marijuana devices since it debuted last year. (Officially, Pax markets its products as vaporizers for loose-leaf tobacco.)

“I was smitten immediately,” says the filmmaker, who, like most people in this story, asked that his name not be used so he could discuss his illegal drug use. “This was just so easy — really smooth.”