Whenever I smoke BHO, the next morning my lungs are tight. Not sure if its the left-over butane or what. I love the high, but im going to stick to bubble bags for my hash.
it could be..most people dont bother cooking it all off totaly, they get lazy and put in a vial or smoke it right away. I cure mine to the point it has zero runnyness, its like hard rock candy. Has to be heated to be pliable, it smokes smooth and never gives me shitty lungs. Thats mine, i cant speak for anyone elses oil....but try not to pass judgement on one persons product, ive had soem real shitty BHO to, but i also know its not the standard so i dont say its all bad and toxic. Alota comercial grade extracts are cut with stuff, like vasoline or added alcohol to add wheight. Thats why i make my own lol, i know its good and clean.
Bubble hash is prolly the safest hash to smoke, as its only a water extraction.