When I was in my teens and 20's I used to see quite a bit of black tar opium here in the States. Most of the consumers seemed to be older Black men,but I don't know why? The product could run from shit to shinola depending on where it came from.
We used to smoke it in glass pipes like crackheads use now. You wanted vape it ,not hit with a direct flame. If it's good all it takes it one good hit.
BTW,it's very addictive. It got my young ass one summer when I copped a couple of O's of it during a big pot drought. I really wouldn't advise using it if you've got an addictive sort of personality. The withdrawal is a bitch.