your metabolism, the stuff used, and the process used to make the brownies are what masters.
people don't develop an actual physical tolerance to marijuana. if that were the case, extracts would be the demand, or people would just quit, because it would be impossible to smoke enough.
i use oxy daily, as well as clonazapam, these i tolerate; what helps me, doesnt get me high would kill or put someone in a coma if they had no tolerance, and the dose ill take a year from now would do the same to me if i tried it now.
but, every day i wake up and smoke the same stuff as i did yesterday, and everyday for medicical reasons, but a few tokes or a joint of the same strain, will always have the same effect.
ive been totally melted down off the same batch of edibles, as the person with me who received zero affect.
metabolism.
a good rule of thumb, eat until the taste is overwhelming, wait near thee hours and eat something else high in B vitamins, the B helps direct sugars, fats etc to where they need to go, and the extra food will stimulate your digestive system further, re invigorating any, "left overs" in your guttywuts.