trying to quit smoking.

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Mu'assel, aka Shisha, can be incredibly unhealthy if it is tobacco based.

Each hookah session typically lasts more than 40 minutes, and consists of 50 to 200 inhalations that each range from 0.15 to 0.50 liters of smoke.[13][14] In an hour-long smoking session of hookah, users consume about 100 to 200 times the smoke of a single cigarette;[13] in a 45-minute smoking session a typical smoker would inhale 1.7 times the nicotine[15] of a single cigarette.

However I found this, note it is lacking citation.

Tobacco-free Hookah products, such as shisha based on herbs, tea leaves, either sugar cane or sugar beets and Shiazo steam-stones, have been developed so as to minimise the harm to the user from the nicotine, tar and other chemicals present in tobacco smoke