+ THC isn't the only thing in weed....

Maybe holding longer helps more CBD/CBN to be absorbed.

I have a volcano though so I can cheat - breath in... hold...
>> and then breath out into the bag

Rinse and repeat - no smoke just some CO2 and water - I can usally breath a bag about 2.5 - 3 times - with a Volcano this will seriously fuck you up.

Recycle - the possibilities are endless