The easiest route is to pick a disposable with a fixed, narrow airflow. No adjustments, no fiddling—just a consistent, restrictive pull every time. This is ideal if you know exactly what you like and you're stocking for a customer base that feels the same.

Look for devices that list their coil resistance. A higher number (like 1.2 ohms) usually means a tighter draw. Also, check the airflow slot: a single small hole or slit will give more resistance than a wide-open channel.

When testing a sample, take a slow, steady puff. Notice how much effort it takes. A tight draw should feel like sipping a thick milkshake through a narrow straw—not like sucking air through a paper towel roll.

One more thing: tight draws tend to produce less vapor, but they can enhance flavor. If your customers enjoy tasting the e-liquid nuances, this is a selling point.