Your generator gives out Carbon Monoxide, a very harmful gas, if you put a generator in a room and close all the windows, everybody in that room d!es.
Now Shisha contains the same carbon monoxide that your generator gives out. This time, they just covered with pineapple or any other flavor. There is certainly an amount of carbon monoxide in shisha or hookah as they call it.

Research has shown that hookah smokers have substantially higher levels of carboxyhemoglobin (COHb), an accurate marker of carbon monoxide in the blood, compared with individuals who smoke cigarettes.
Due to the mode of smoking-including frequency of puffing, depth of inhalation, and length of the smoking session—hookah smokers absorb higher concentrations of the toxins found in cigarette smoke. 60 minutes of hookah is equal to smoking 40- 400 cigarettes.
Hookah smoke that you inhale can contain 36 times more tar than cigarette smoke, 15 times the carbon monoxide, and 70% more nicotine than one cigarette. Hookah smokers may absorb more toxins and cancer-causing chemicals than cigarette smokers.
Daily News Reporters