Re: you might be a hookah nut if...
when you and your friends make excuses why you CAN'T go home to do homework and insist that everyone meetup at the local lounge to smoke hookah and "do homework". And stay 3 hours after your homework is done.
you do the aforementioned at LEAST 3 times a week.
You tell people you can't hang out for another hour or so because you just put fresh coals on a fresh bowl and you MUST finish before you can come out to play.
The local shop owners know you by name and give you discounts and their personal numbers to reach them.