Mushrooms are different, weight does not always have a direct relationship with how potent they are, prolly a better way to word this. Some people are also hypo/hyper sensitive, blood sugar plays a role. A lot of variables, the hardest I've ever tripped was on about 1.5 grams, and I usually eat around 3. Ive never been on the level described above, but have had experiences that were absolutely on their way to it. With enough psychedelics, it's certainly possible.