Think of the whole device as a mini ecosystem. The battery needs to deliver consistent power, the coil needs to heat evenly, and the wick needs to supply liquid at the right rate. Cold disrupts the liquid flow, which throws off the balance. If the wick is starved, you get a weak hit and a burnt taste. If condensation blocks the airflow, you get a tight draw and gurgling. And if the battery is too cold, it may not deliver full power, which makes the coil heat slower. That's why a vape can feel completely different at 50°F than at 70°F.