recovering alcoholics or a present alcoholics brain's receptors go on the fritz when they ingest DXM. it causes addiction usually. scary stuff.
Aren't the kind of people you just mentioned already addicted? I WILL say, however, that I had MAYBE 2 beers when I was on dxm and completely blacked out. No memory of the events at all. The next day my friend told me that I stopped someone driving on the street, went up to his window and said to him "If only you knew" I wouln't mix em.