I wouldn't recommend grinding mushrooms into your soil mixture either, but the use of myccorhizae, particularly in the form of an aerated compost tea most certainly has very noticeable effects on cannabis.

Regular applications will greatly boost nutrient uptake, help prevent disease, increase root mass, increase drought resistance, as well as improve the structure, texture and moisture holding capacity of the soil.

These are the documented, scientifically proven effects of myccorhizae - they do work, and they work amazingly well.