A study of light-use hookah or waterpipe smokers found evidence of lung function abnormalities, including marked changes in cells lining the airways, a new study shows.  The study showed that, compared to one cigarette, one waterpipe session exposes the smoker to much more toxins and carcinogens, including: 2 to 4 times the amount of nicotine, 7 to 11 times the amount of carbon monoxide, 100 times more tar, and 17 times the amount of formaldehyde. Read more