We just ran 2 pen fulls off one can, and there is still a lot left. Most of the thc comes out in the first few seconds it looks like. I just made a sweet vaporizer out of a light bulb and extracted the oil right into the bulb. It works so badass. Just use a pen as a mouthpiece, but make sure you don't touch the inside of the bulb with the pen. I am so high right now. omg. and i have class in like 4 minutes s hit
