Airflow affects how much vapor you get and how it hits your throat. A tighter draw mimics a cigarette, while a looser one produces more vapor. If you're new to button-fired devices, start with a looser airflow—it's more forgiving and easier on the lungs.

Adjusting airflow is usually a ring or slider near the mouthpiece. Turn it to the wide-open position, then gradually tighten until you find a comfortable draw. This isn't a one-time setting; you might change it based on the e-liquid you're using or your mood.

For travel, consider setting it to your preferred draw before you pack it. That way, it's ready when you land.