Why is wine not prohibited in Paradise as in this world?
Wine is not a prohibited thing itself rather it is forbidden to be taken owing to the bad effects it causes. This follows that when its harmful element i.e. causing inebriation is removed, there exists no reason to render it forbidden. The wine provided to the believers in Paradise will be rid of intoxicating effects. The Almighty says:
There will wait on them immortal youths with bowls and ewers and a cup from a pure spring. Wherefrom they will get no aching of the head nor any madness. (56:17-9)