Mushrooms are not physically addictive, nor would you want to take them on a regular basis. As with any mind-altering substance, though, their psychological effects can be compelling and therefore hard to resist.

As with any drug beware of doing too much, too frequently and letting it define you. Be careful.

tolerance
Tolerance builds up rapidly with mushrooms. For 24 hours after a trip you have to take twice as much to repeat the same effect. Tolerance lasts about three to four days.

There is also some cross-tolerance with other psychedelic drugs of the tryptamine family (such LSD and DMT) but not E or Ketamine.