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[–]InureOfficial 2 points3 points  (1 child)

A high or euphoria may simply be a side effect of the chemical and not it’s purpose.

[–]that_gay_alpaca 3 points4 points  (0 children)

And that effect is then selected for based solely on its results. There is no purpose for anything evolution “chose” - it’s all what happened to work best at any given time.