One common mistake is assuming that a higher puff count means a better device. Not always. Puff count depends on several factors, including battery capacity, coil efficiency, and how the user vapes. Two devices with the same puff count might feel wildly different in practice.

Another mistake is ignoring coil resistance when comparing devices. A lower resistance coil draws more current, which can stress the battery. If the battery isn't rated for that draw, you risk overheating or premature failure.

Finally, don't skip the e-liquid volume check. Some devices list the total liquid in the cartridge, but the effective vaporizable volume might be less due to wicking inefficiencies. This can lead to complaints about short lifespan.