Another thing to take into consideration if your getting lightheaded, you may not be getting enough O2. Lounges have alot more smoke roaming around, plus I've noticed that I smoke MORE at one.
But Nakhla and Tangiers Noir are the two more BUZZING shisha tobacoo's that I've smoked. Al Waha has a good buzz, but it's different - more sleeply and mellow than either Nakhla or Tangiers. Experiment with different brands and such not....
And I believe completehookah.com
lists which brand is washed and not.