here in germany we have a new brand of "tobacco" called Noor NoBacco.
It's nearly the same as Soex, but the taste is better.
Soex tastes like soil
If it's harmful or not isnt tested yet. Because they use sugarcane instead of tobacco, there is no nicotine. Nicotine isn't really harmful. The problem is the tar, and sugarcane also produces tar, when you light it
So there is no difference in harmfulness. Maybe the danger to become addicted isnt that big ... (but im smoking hookah for 3 years and im not addicted too... i can stop smoking for a few weeks, without any problem)