Magic truffles are the sclerotia of Psilocybin mushrooms that are not technically the same as “mushrooms”. They are masses of mycelium that contain the fruiting body which contains the hallucinogenic chemicals psilocybin and psilocin
Physical addiction to magic truffles has never been documented, however psychological addiction is possible. There is 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. Through (temporary) abstinence the tolerance returns to baseline without any withdrawal symptoms.