What is proper hookah etiquette?

We will answer on the presumption you are smoking Turkish tobacco or some other legal substance. The host is in control of the mouthpiece, and you never grab it with out it being offered to you by your host. Do not retain possession of the mouthpiece beyond the time others in the group are using it. Try to keep this shared instrument as clean as possible . For some groups, this is a time-honored tradition, and your host should be sincerely thanked for including you in what is generally considered a male bonding experience.