Stage one: Grind up the ethonobotanical product, in this case, camomile!
Then I placed the vaporizer in my mouth, and placed my lighter directly under the very end of the tube.
That was a mistake, the camomile burnt, and I was just smoking...
Then I realised, you must hold the lighter (or candle - save butane), further down, and such hard, as if you were drinking a milkshake, or smoothie.
Camomile vapor defintly tastes different to smoke. Smoother and tastier.
I continued doing this and noticed the camomile go a dark brown colour inside, like I was sucking the life out of this plant.
I wasn't that high, so I took the camomile out, grinded it up a bit more, and placed it back in, and repeated the above.
The camomile's effects were clear as I slept easily. Camomile is a legal plant that can be purchased in any supermarket.
I suggest the use of candles with this vaporizer, and don't hold the flame too close or your just smoking.
More Information on the Tube Vaporizer (and pictures, too)