As with many psychedelic substances, the effects of psychedelic mushrooms are subjective and can vary considerably among individual users.

A harm reduction approach is an alternative to drug prohibition laws that criminalize users of psychedelic substances.

The use of "psychedelic" substances for healing and spiritual enlightenment has a 5,000-year history.

A psychedelic substance is a psychoactive drug whose primary action is to alter cognition and perception.

Despite the similar name, mezcal does not contain mescaline or other psychedelic substances.

The decision to dismiss him may have been influenced by his role in the popularity of then-legal psychedelic substances among Harvard students and faculty members.

Annie was no stranger to the so-called psychedelic substances made popular by the hectic climate of recent years.

And this new god's burning bush was nothing more than a psychedelic substance called loranthus growing on acacia-a bush sacred to the Sun.

It's not tackling complex computer problems, absorbing new psychedelic substances, or living through designer shamanic journeys.

People whose primary expectation when taking a psychedelic substance is medical, are particularly likely to fall into this trap.