You don't need a lab to see this in action. Think about what happens to honey in the fridge—it flows slowly. Warm it up and it pours. Same idea with e-liquid.

Here's what you can test yourself:

• The pocket test: Put your disposable in your jacket pocket for five minutes. Take a hit. Compare it to one that's been sitting in a cold backpack. The warm one will almost always produce more vapor and taste fuller.
• The draw test: With a cold device, take a long, slow drag instead of a quick puff. The coil needs extra time to heat the thicker liquid and turn it into vapor. Slow and steady wins this race.
• The shake test: A gentle shake before use mixes the liquid and helps it flow into the wick. It's not a fix-all, but it helps in a pinch.

These aren't just my observations—they're consistent with how vape hardware is designed to work. Manufacturers optimize wicking for room temperature, so it's normal for performance to dip when the mercury does.