Ask your regulars what they think. You'll quickly learn that some love a tight draw, others prefer a airy hit, and many just want consistency. Use that feedback to adjust your stock.

For example, if your customers are mostly former smokers, they might prefer a device with a tighter draw like the LINQ-PRO. If they're flavor chasers, a device with a larger e-liquid capacity, like the VERTEX-VISTA, might be the draw.