Thomas Jefferson once said, "If people let government decide what foods they eat and what medicines they take, their bodies will soon be in as sorry a state as are the souls of those who live under tyranny."
Mushrooms are not addictive either physically or psychologically. If continued mushrooms use is excessive within a short period of time, a tolerance will build giving the drug little to no effect anyway. Additionally, studies show that one's desire to ingest "magic" mushrooms decreases over time.
Safety: Mushrooms are a very safe experience. The toxicity is only one and a half times that of caffeine (which is drank on excess by millions dailly, and the mortality rate as a result of mushroom's toxicity is an incredibly low 0.016%.