Lyric discussion by Doktr 

Cover art for Illuminaughty lyrics by Infected Mushroom

I still think that this is a reference to psychedelics:

I have tasted of the fruit and it's opened up my eyes It's given me a thirst that's so hard to satisfy

The "fruit" refers to psychedelic drugs, "opened up my eyes" to a new, deeper reality. After seeing this new reality "It's given me a thirst that's so hard to satisfy" - A "thirst" for new experiences, that can only be "satisfied" through psychedelic experiences. Just my take.

I agree.

@Doktr Yes I think they mean mushroom by the term fruit.