Yeah, originally I thought it said a 5g dose of psilocybin, and I was thinking Holy Crap. But then realized it said mushrooms, did a quick search and it said 3.5g.
To be fair, I handle my drugs very badly. My local shop laughs at me because I am the only one they've ever had ask for "The weakest thing you have". So thinking at nearly 50% more than the "average" seems crazy to me.