Re: cigs vs. hookah.
I really have no opinion on this subject. But I did a visual test - unscientific of course. What the "test" shows is open to interpretation.
Basically I took a normal drag off a cig and exhaled into a white coffee filter.
The result was a mustard colored mess.
Then I did the same with the hookah - there was nothing visible on the paper at all.
I also inhaled directly through the paper with both.
There was a deep brown stain where I inhaled the cigarette smoke.
Again, nothing visible with the hookah.
I can not claim that this shows anything one way or the other But it IS interesting.