It's because ethanol--a tiny molecule--affects myriad brain loci and pathways, too numerous
to analyze with much confidence ('causality' and like that) whereas the Fun-stuff ingested by millions of homo-saps --with BIG molecules--target a (bearable number of) pathways which Can be deduced.. at least that's the tl;dr best treatment logic of the syndrome-deciphering ..which I've found to date ;^>