Take a clear light bulb, hollow out the insides and remove the bottom metal part. Take the top to a water bottle (plastic, Aquafina or Evian, whatever.), just the spout, and duct tape that bad boy onto the bottom of the bulb. Then, screw the cap on the bottle part and punch 2 holes into the cap with a knife or something. In one hole, insert a straw (or a pen, hollowed out, or some tubing from a hooka, or whatever you can find), use the other one as a carb. You grind your weed up, put it in the bottom of the bulb, screw the top on the bottle, heat the weed just until it smokes a little (It's actually a white vapor, that's the good shit, so don't let it condense.) Take a slow, long hit from the straw (or pen) and hold it. Then, exhale. I guarantee after 4 or 5 of these, you'll be pretty well fucked.

The hole you're missing is a carb. You have to let air in for the vapor to condense. you plug the carb as soon as you see the vapors, then let off when they start to build up a bit... take a long slow hit and it should start to vaporise much faster.

Good luck, dude.