'Spiritual' dimension

According to Gaia theory the world is a holistic mechanism of life, and this can be rationalized if we take into the equation various natural substances that positively reinforce life, primarily food. What, then, do we make of others that life is strangely attracted to but doesn't feel necessary for survival (even is some of it may be used as food, but most isn't) like psychedelics? Humanity has used such substances for quite some time, historically, but has recently stopped. Survival is certainly something likely without consuming these wild things of the Earth, but what if - in the long-term, on an evolutionary scale our "spiritual" dimension starts to erode (which is really a metaphor for the mind) - as that's the purported nourishment tribes received in their rituals. Food maintains us physically, but that is short-term, as is sleep, and only after so long in history have neuroses, depression and others been detailed. Humanity may have become fearful, but is this possibly an evolutionary reaction driving a species extinct by their mental processes?

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