One school of thought in current studies of archaeology and anthropology is that modern humans in the middle / near east developed yeast-risen bread as a by-product of making an alcoholic drink or 'porridge'. In south america, the use of mescalin and peyote in association with religious rites is well documented. There seems to me to be plenty of evidence to suggest people have a deep rooted instinct to experience alternative forms of consciousness, or simply get sh1t-faced. If you can find a copy, Aldous Huxley's Heaven and Hell / the Doors of Perception is an interesting read on the subject - he calls it the human desire to reach 'the mind's antipodes'. (Yes, that's where Jim Morrison got 'The Doors' from.)