Re: cigs vs. hookah.
The way i see it...
The pure white smoke is a product of the glycerin in the tobacco mixture. The tobacco has been washed multiple times in most American's cases, but in all cases it is 100% pure tobacco, no poisonous additives. I don't think there is a study that proves tobacco causes cancer, only cigarettes. I always say the worst part of a hookah is the coals; they release small (or large in some cases) amounts of a gas that is toxic to humans and deadly in large amounts. Yet if you are careful, you won't get any ill-effects.
I have never had a cough, I have never had any staining in my throat or my teeth, I am more fit then I was 2 years ago, my lung capacity is larger because I smoke hookah (a lot of lung work).