John Rush said this quote

Inhaling fumes directly from burning foliage, either in a confined space such as a cave or a tent, or scooping up and breathing in the vapors from psychoactive plant materials scattered on a bowl full of hot coals, must be an extremely ancient practice. Herodotus's account from the fifth-century BCE, describing the use of small tents by the Scythians (a northwestern Iranian tribe) for inhaling the smoke of cannabis, is probably the most famous account that confirms the antiquity of the use of cannabis as a ritual intoxicant.

~ John Rush

The effect of hallucinogenic mushrooms on the user's experience and behavior depends in part on his or her personality and genetic predisposition, which can vary to a great extent from person to person. As symptoms of psychiatric disorders can sometimes be elicited after one-off use, people with a genetic tendency to depression or psychosis should be discouraged from using psychoactive mushrooms.

~ John Rush

Several centuries ago it was believed that the fly agaric, combined with the bufotenin–containing mucus of toads, was an ingredient of witches' brews, which made flying on their broomsticks possible. Even Santa Claus and Father Christmas are connected to Fly Agaric and their reindeer, which, by the way, like their portion of fly agarics and 'living' water.

~ John Rush

Due to their soft bodies and ephemeral nature, it is unlikely that biological evidence of mushrooms will even be discovered in the archaeological record. This fact poses certain difficulties in determining the antiquity of modern cultural uses of psychoactive mushrooms, like those in Mexico and Siberia, and makes it even more difficult to determine whether psychoactive mushrooms were recognized and used by historical culture groups that are now extinct.

~ John Rush