The benign type is seen in benign lesions such as benign tumors and following trauma. An aggressive type is seen in malignant tumors, but also in benign lesions with aggressive behavior, such as infections and eosinophilic granuloma.
When setting up a Hookah air system, you will frequently need an array of metal fittings. For use around water, you should use stainless steel or brass fittings only. This is especially important when diving in salt water. Fittings made of ferrous metal will rust or corrode when used in, or near a water environment.
I am in the process of opening a hookah lounge in Ny and I was told by the NYS BOH that if you are using the popular BLACK shisha that has no tar or nicotine or tobacco there is no age limit. However we are setting the limit at our store to 18. Good luck! 2 people found this useful.