OT: "Hookah is also called [...] hubble-bubble [...]"
Citation needed.
There are multiple uses of it in Google search results.
"Other common names for waterpipes include [...], and hubbly-bubbly."
They even cite a study entitled "Hubble-bubble (water pipe) smoking: levels of nicotine and cotinine in plasma, saliva and urine". [2]
This rabbit hole goes deep!
[1] http://www.lungusa2.org/embargo/slati/Trendalert_Waterpipes....
[2] Shafagoj YA, Mohammed FI, Hadidi.KA., Int J of Clin Pharmacol Ther 2002 Jun; 40(6): 249-55.
This known carcinogen should be treated with respect, even when taken by alternative routes, until there is data demonstrating that the cooling mechanism actually improves safety.
My main intent was to save every other person that did a double take the trouble.
http://www.cdc.gov/tobacco/data_statistics/fact_sheets/tobac...
would be the volume of smoke inhaled (hookah session = 150 cigarettes). Equivalent is probably the wrong word to describe that.