The hell is SWIyou torching it for? Opium
doesnt need to be superheated or anything. Thats why back in the day they used simple lamps that channeled the flame to the bowl.
If SWIyou are using anything with a yellow flame (zippo, candle, or what have you) and are still getting cracked glass then thats just weird.
Anyway... A far more pressing concern is this black tar opium. As far as SWIM
has searched high and low there is only OPIUM. Not black tar, or red rock, or purple goblin or whatever. Opium is a plant matter as has certain traits, none of which are blackish or tarish unless already smoked one would imagine. SWIyou has heroin
or some heavly adulted opium. Course SWIM might be totally wrong, but he has never heard otherwise...
And theres always foil.