Vapor drip often referred to in the context of vaping, typically means the condensation of e-liquid that can occur when the vapor produced by the e-cigarette or vape pen cools down and turns back into liquid form. This can happen for several reasons:

1. Temperature Change: When the vapor cools down, especially if you exhale into a cold environment, it can condense and form a liquid.

2. Leakage: Sometimes, the device may not be properly sealed, causing e-liquid to leak out and appear as vapor drip.

3. Overfilling: If the tank or cartridge is overfilled, it can lead to vapor drip when the device is used or moved.

4. Quality of Device: Low-quality or poorly maintained devices may have issues with seals or wicks, leading to e-liquid vapor drip.

5. Usage Habits: The way a person uses their vape can also contribute to vapor drip. For example, chain vaping (taking multiple hits in quick succession) can cause the wick to become saturated and release excess liquid.

To prevent vapor drip:

- Ensure the device is clean and well-maintained.
- Avoid overfilling the tank or cartridge.
- Use the device in a manner that doesn't overly saturate the wick, such as taking breaks between hits.
- Store the device upright to prevent e-liquid from pooling in one area.

If you're experiencing excessive vapor drip, it may be a sign that your device needs maintenance or replacement. Always follow the manufacturer's instructions for use and cleaning to ensure the best performance and longevity of your vape device.