You're inside a store, it's air-conditioned, you step outside and it's 80°F (27°C) with a breeze. That temperature swing can cause condensation to form inside the mouthpiece. You take a puff, and instead of smooth vapor, you get a gurgle or a tiny spit of liquid. Most people think their device is broken. It's not.

What's happening is moisture from the air condensing on the cold parts inside. It's like when your glasses fog up. Give it a few minutes to acclimate before you vape. Hold the device in your hand, let it warm up, and give it a gentle shake (with the mouthpiece covered) to clear any droplets.

If you're moving between indoor and outdoor repeatedly, keep your vape in a pocket close to your body—your body heat helps stabilize the temperature.