Why Do Humans Get High?

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It’s easy to explain the appeal of drugs like heroin and cocaine, which directly stimulate the brain’s reward centres. What’s less easy to explain is the appeal of psychedelic drugs such as LSD and psilocybin that produce altered states of consciousness. After all, there’s no obvious reason why unusual patterns of thought and perception – typically, the symptoms of poisoning or illness – should be attractive. And yet, people not only pay money for these experiences, they even run the risk of being imprisoned or worse for doing so. Why is this?

One answer is that these drugs provide short cuts to religious and transcendental experiences that played an important role in human evolution. The logic behind this idea becomes clearer when we look at how human culture was shaped by religious ideas.

For some time, anthropologists have argued that religious people are more cooperative than nonreligious ones. For small...

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