That is untrue az! All you need is a good pharmacist with the right medicine. You do not need to know the grower, just the suppliers who go to producers need to know the growers.

Where I am in the midlands the bud is crap!! In this instance one must know clients of producers else all you gunna get is contaminated bud. I just stick to weed currently in the hope that my normat pharmacist is able to get clean stock.

I don't think it is glass. But I believe sand is used to produce glass so burning sand in a joint cannot be healty as the vapour/smoke/mutated molecules exposed to high temperature might have toxic elements.