Here's a link I found:
http://www.goaskalice.columbia.edu/2456.html
Here's an excerpt from the link:
Quote:
The tobacco mixture used in the pipes is usually 30 percent tobacco and 70 percent fruit flavorings, molasses, and/or honey — though the amounts can vary by manufacturer.
Some studies have also shown that a person inhales 100-200 times more smoke (by volume) during a typical one hour hookah smoking session than when smoking one cigarette – because the hookah smoke is cooled by water, it can be inhaled more deeply and held for a longer length of time. On the other hand, because hookah smoking is usually a social activity, those who use hookah pipes might not be smoking as often or as much as cigarette, cigar, and pipe smokers.
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I smoked for over 12 years and quite about 2 years ago. However, I will still smoke a hookah about once a year when we visit my brother-in-law.
I think people who don't smoke will do this because it tastes and smells different and is done socially.