Magic truffle

In October 2007, the prohibition of hallucinogenic or "magic mushrooms" was announced by the Dutch authorities.

[3] Today, smart shops in the Netherlands offer magic truffles as a legal alternative to the outlawed mushrooms.

As the psychoactive constituent of magic truffles is psilocybin, the prodrug to psilocin, addiction is not possible by conventional definitions.

However, tolerance to psilocybin is a well understood concept, with repeatedly higher doses being needed in order to achieve the same effect, due to the down regulation of 5HT2A receptors.

[6] There is also documented cross-tolerance between psilocybin and LSD, meaning that a higher dose of these substances is needed to get the same effect when a person consumes them with high frequency.