Psilocybin Lasts a Year

Maybe. A new paper forthcoming in the Journal of Psychopharmacology finds some evidence for this, though.

In 2006, Roland Griffiths of Johns Hopkins University in Baltimore, Maryland, and colleagues gave psilocybin to 36 volunteers and asked them how it felt. Most reported having a "mystical" or "spiritual" experience and rated it positively.

More than a year later, most still said the experience increased their sense of well-being or life satisfaction, Griffiths and colleagues report in the Journal of Psychopharmacology.

I wonder about these volunteers and about the small sample size, though.