Does using a bong waste weed?`

[EpsilonX]

I usually hold it for about 20 seconds. How long do you folks hold your tokes?

twenty seconds is to much, thats what leads to loss of brain cells.
holding for 3-5 seconds is perfect becuase within the first 3 seconds 9x% of the thc is absorbed by the lungs.
atleast thats what I heard from my health class from a stoner teacher back in high school.