You guys probably didn't get high off of it because you didn't have that much smoke in the vapourizer. It should be so clouded that all you see is white and you shouldn't be able to look through it. You also should hold the smoke in longer to absorb all the thc, because you don't have to worry about carcinogens that much cause you're not scorching the dope. I would use a pop bottle cap instead of kleanex.