snmfmy has some very respectable knowledge I have repeatedly witnessed. But we need to remember, we do not have enough research over several generations about the "issue" in hand to make final conclusions.
Please, do listen to your body and your gut feeling. Take breaks of drugs. It seems that 4-mmc can be consumed in much higher rate than, say, MDMA, according to several people I have read posts from, but it is still hard drug, and it is best for your health and well-being to not entirely rely upon it or wait for it all the month. It might be there is some adversary effects only studies waiting to be executed, will point out.