yah....the wax is too troublesome for my memory circuits though it's almost 23 years since I last fired up a glass tube.
A friend gave me a holiday package of approx 2 ozs green, a half dozen oil cartridges and a couple small sheets (about 8 grams) of wax. I used all the former and gave the wax away to another Out as barter for more cartridges
I also very much enjoy the taste variety of diverse hydro flowers, but in now my 43rd year of use don't mind reducing the burning smoke. I recognize it is not even remotely akin to burning tobacco but also am not blind to the inevitable buildup of tar in my lungs. There is very little legit evidence that contributes to lung cancer or emphysema but it absolutely can result in incremental reductions in general lung health and capacity