Suggest not inhaling too heavily when you adjust to the small airflow hole

You may encounter the situation that there appears oil spilling when you inhale too heavily especially when you use the small airflow hole level on Aspire Nautilus. Because a small airflow hole means less amount of air flow and your inhaling too heavily will cause the smoke oil being inhaled into your mouth when they are not completely vaporized. As a result, there possibly appears that you suck the smoke oil into your mouth.