Experience that is induced from 4-6 grams dose (psilocybe cubensis) is not even comparable with lower doses where you still can resist. It is not for everybody, as neither taking psychedelics at all is, but I have completely ditched lower dosing. Except taking only 1 gram for walk through the woods.
Remember, this is my own experience that I am writing about. Some people have body chemistry and for them to experience the same level is enough to take half I am taking. Objective and especially subjective component plays the biggest role with the psychedelic class of drugs. But there is very distinct qualitative difference of the trip between taking 2 grams of mashrooms and 6 grams (talking about home grown psilocybe cubensis).
I will repeat once again - this all comes from my experience and the effects I get. It could be totally different for you and some people should stay away from these substances.
Take care!