One mistake is assuming all disposables with a small airflow slot are tight draws. Coil resistance matters just as much. A device with a tiny slot but a low-resistance coil might still produce a loose, airy draw.

Another is ignoring the battery. A weak battery can cause inconsistent heating, which might make the draw feel uneven. Test multiple puffs over time to see if the draw stays consistent.

Finally, don't forget about humidity. Spring showers can add moisture to the air, which could affect vapor production. If you're testing outside, do so on a dry day to get a baseline.