Mushrooms are neither physically addicting nor likely to cause psychological dependance. Many people actually find that their desire to use mushrooms goes down for a period of time after use. As with most substances, some people will use them more than they are comfortable with. There is a short period of tolerance after Mushroom use. Using Mushrooms two days in a row is likely to lead to a diminished experience the second day, though spaced 5-7 or more days apart, this effect is nearly gone.