Re: sneaking smoking hookah.
I am not a fan of deception. If you live someplace that does not allow smoking for any reason then just respect it. I live in an apartment where smoking is a no go. I have never smoked in my living space. I have been smoking for around three years and it has always been at friend's houses.
If they are just iffy about the smell try to reason with them. If you go behind their backs and lie to them you are just hurting yourself in the long run. They will be less apt the negotiate and will be more convinced that you don't have the self control necessary to deny addictive and detrimental effects.
If you are straight forward and respectful you will get much farther than being deceitful and ending up in the inevitable argument and mess.