At the end of the day, take a minute to check your device for any issues. Wipe the mouthpiece with a dry tissue to remove any juice that may have condensed. If you notice any liquid around the bottom, that means a seal is failing—stop using it and dispose of it properly. Don't try to charge a leaking device; it's not worth the risk.

If the device is still good, store it upright in a cool, dry place. A desk drawer or a shelf away from heat sources works well. Avoid leaving it on its side overnight, as that can cause the coil to flood.

For wholesale buyers, make this a habit when you're testing multiple units. A quick visual check and a clean storage spot will tell you a lot about a product's quality.