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

The growth patterns of mushrooms are difficult to view since they come and go so quickly, appearing and disappearing overnight as if by magic. Their apparent lack of seed is another feature that was likely observed by early peoples who encountered them, perhaps providing further mystery as to the origin of the strange organisms.

~ 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