When you dab it sometimes happens that large quantities of vapor come out from the nail when you've stopped inhaling and this is because the vaporization wasn't efficient enough. If you like larger dabs it's worth to complete your setup with a carb cap which maximizes the airflow and forces the heat into the middle of the nail. This makes it easier to inhale a larger amount but it also lowers the risk that your material vaporizes in vain. There are carb caps in both glass, titanium and ceramic in different designs, we have a number of more basic kinds to get started.