Difference between Cigarette and Shisha

Hi Everybody;

During the last week in Speaking class there was a debate about the difference between Cigarette and Shisha, and I would like to clarify the followings:

        Shisha was invented by a physician called Hakim Abu Faith in 15th century, as he thought wrongly that the amount of nicotine can be reduced if the smoke pass through the water and ,therefore, the smoking will become safer. Actually researches showing that smoking Shishah tobacco is more dangerous than smoking Cigarettes. Shisha smokers often inhale more smoke than cigarette smokers because of the length of time a Shisha session lasts. One session can last up to an hour during which shisha smokers will inhale a large amount of tobacco. A report from The World Health Organization (WHO) noted that the smoke inhaled in a typical one-hour session can equal 100 cigarettes or more. The WHO report also claims that even after it has been passed through water, Shisha tobacco smoke still contains high levels of cancer-causing chemicals. Shisha smoke may also contain combusted charcoal or wood which can increase the chemicals in the smoke that cause cancer and heart disease. 

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