The McKennaiis magic mushrooms first appeared on the scene in the early 2000s in Holland. McKennaiis magic mushrooms are popular in the Amsterdam drug culture. Users report McKennaiis is powerful and sometimes it is euphoric, and sometimes it is much more introspective and deep. More experienced trippers love this particular shroom because they feel that the high can be a more controlled experience than some other mushrooms, once you understand how to master it. For starters, start with a lighter dose and work your way up from there.