The airflow channel—the little hole at the bottom or side—does more than you'd think. If it's blocked by pocket lint or condensation, the draw gets tighter, and you might pull harder without realizing it. A harder pull draws more liquid, but it also draws more heat into the wick. On a commute, your device sits in a pocket, picks up fluff, and you pull harder to get the same hit. That extra effort can dry the wick faster.

Next time you get a burnt taste, check the airflow first. A quick wipe with a tissue or a gentle puff of air through the mouthpiece can clear minor blockages. If the draw feels easier, you may have solved it.