I am a stoner, decent weed tolerance and smoking just about daily. Took shrooms twice. one time was shwag shroomers that did nothing. Next time i ate one single shroom (not a big one either) . My buddy was there all fucked up like dude keep eating. Well i tripped balls for 6 hours including a phone call back home to my wife to get myself grounded haha.
I've noticed there's a huge variation in tolerance to mushrooms, even among people who share a similar tolerance to other substances. Like an order of magnitude difference.