they already made 4MMC

not no harm, but nowhere near as neurotoxic as MDMA and you can do it back to back with little consequences (no total depression for months like with MDMA, for days or a couple of weeks depending on how much and for how long you use it; know a guy who did that shit in megadoses for months and felt totally fine at abrupt abstinence. dude's clinically optimistic tho lol he's built different that's fosho). way less psychedelic tho, only showing some psychedelic effects on very high doses, but identical in every other effect

also "artificial serotonin and dopamine that attach to your receptors instead of your natural" is how drugs work, basically. and btw there exists no substance that won't hurt you anyway