A hookah.The tea-house was theoretically for men only, but women and men smoked the hubble-bubble together....
You can also smoke an apple-flavoured tobacco in a hubble-bubble pipe if you have time.
A tea-house tucked under it is described curiously in my guidebook as a place, ‘to sit and drink tea or smoke the hubble-bubble, surrounded by slumbering Esfahan manhood.’