I'm not sure if that is technically true. Hookah tobacco is wet, won't burn. It is heated indirectly by a coal on top of it, seperated by aluminium foil. In fact, you are "cooking" or "baking" the tobacco (which sometimes even isn't tobacco) and you inhale the resulting fumes. Only the coal is burning, not the tobacco.
lol wat? The tobacco isn't burning, just magically turning into smoke that you inhale?
A hookah (South Asia: हुक़्क़ा (Devanagari), حقّہ (Nastaleeq) huqqah)[1][2] also known as a waterpipe[3] is a single or multi-stemmed (often glass-based) instrument for smoking in which the smoke is cooled and filtered by passing through water."