Great pipe for your pocket @Jetdro! I love mine. Where’d you find em for that price?
As for the venturi effect, it’s a simple principle of restricting flow. In turn causing a nice cool pull. Too bad Jack isn’t around to tell us more. He wasn’t known to not do his research.
It also tastes good each time I light it. Can’t say that for many devices. It’s all about packing it well and it helps that the lid snuffs it out perfectly.