It's quite easy to take in 50 mg in one hit. There is nothing complicated about lighting, just keep the flame from direct contact with the stone,  within 3 seconds the spice has been vaporized and it's in the bubbler chamber.

This system does cost a bit more then the GVG, but having a bubbler is handy for ganja too. Just use a different slide or bowl piece. Compared to the GVG, I find the vapor to be much smoother, it almost has no taste. Probably because it time to cool before entering your lungs.

These ceramic stones are way cool. It's neat seeing the spice melt, disappear, and turn to vapor.