Personally, I don't get much higher off of a hooka unless there is a loooot of weed in it. The reason you get so much higher off of a hooka is most likely because of all the tobacco. I have gotten much higher (though it felt like I was lightheaded- kinda like whippets- N20) from a straight hooka, no weed, than with weed alone. Of course it was pretty much my first time and I was taking monster rips. Ended up with a bad headache...

I wouldn't recommend a hooka if you're just looking to get really high... its more sociable with a hooka, but I think with less of a buzz...