Most users fiddle with the mouthpiece or the power button, but the real control is often the small holes on the side of the device. They're easy to miss, especially if they're tucked near the base. If you've never noticed them, look for a ring that rotates or a slide that moves.

Those holes are the gateway for air. When they're fully open, you get a loose draw—air rushes in, diluting the vapor. When they're partially covered, the draw tightens, and the vapor becomes denser and warmer.

During a commute, this matters because you often need to adjust on the fly. Maybe the wind picks up, or you want a quicker, more discreet hit before stepping into a meeting. Being able to feel for the ring and twist it without looking—that's a skill worth practicing.