I have smoked hash oil before. Crazy experience, it was like being more stoned than I've ever been, ever. I did it by using a knife and a hot needle, but I suppose a cigarette would have been more efficient. A joint would have been way too much.
I remember the first night me 2 of my boys and this chick smoked hash oil we stood up allnight talking thought it was like midnight and the sun came out we was like whoa thats some good shit.