Has anyone tried this veporizer from grasscity (The Original Grasscity.com Vaporizer - Dutch - Grasscity.com). I just recently purchased this unit and I can't really get it to vape the herbs. I dont know if im doing it correctly because there were no instructions and I've never vaped before. My herbs turn brown after turning the "on" knob counter-clockwise to the end (highest setting). However, I dont see any vapor clouds or vapors inside the glass dome. I take a draw from the unit and can barely taste the herb. I assumed since my herb started to turn brown on me, that the unit was vaporizing. What do you think? Is the herb turning brown an indication that the unit is vaporizing? I know I should've bought a DBV or Vaporbros but wanted to try this unit since it was so cheap.