of all the drugs out there, i would say that DXM is one of the best.
at least in my 2 years of off/on using/binging, resulting in a coma from a 2g dose (which lead to my quitting DXM), i can say that it has FORCED me to respect it al times, and has given me some great times/experiences/insights as well.
i have found just as many people dont like it as people that do. alot of "us" find the trip very introspective, even moreso entertaining with some awesome CEV's. then again, alot of us dont like it because of those harsh afterglows (which, by the way, if thats the only reason you dont do it, you are such a pussy

).
personally, i dont believe most of the theories thrown around about brain damage, etc. i can see liver damage though. for example when i took that 2g dose. not all of it was digested, some just gets to rot my liver for awhile.
but i have heard people try and tell me that it turns your brain to a jelly like substance, that it causes brain cells to overheat, explode, and leave littles "holes" in your brain, etc.
i'll tell you about that 2g dose i took. i dont feel like explaining the trip, that would be a thread in itself, but i'll mention recovering from it all.
in the winter of 2003 started to dex more and more, eventually slipping into redosing binges. well, at the hieght of it all, i remember taking 450 mg's DXM, some little tryptamine sandwich being passed off as E, beer, and weed. well, the fake E, beer, and weed were new introductions to this binge, but i had been redosing and sleeping only when i couldnt stay awake any longer, redosing 2 hours after the intial dose, and 2 hours after that, etc for about a week now. i started with my standard 2 bottles of robogels, redosing with another 1 bottle. well, i got sick of swallowing +100 robogels a day, so i busted out my powder stash i was saving for summer.
DXM found in OTC medications and the powder form is sooo much different. i find it to actually be kind of suck ass compared to robogels... i think the reason for this is that the Robogels have certain chemicals like sorbitol and such help more DXM absorb into your system, where the powder can sit in your stomach for hours making for some loooooong ass trips that never really peak, and feel like one big fucking afterglow half the time.
anyway, back on topic, yeah, all the drugs and the constant redosing must have fucked me up good, because the last thing i remember was sitting in a very comfortable chair trying to play LOTR. this was about an hour after taking the fake E, and 6 beers, 1 grav. bong hit.
system overload!
yeah, i wake up in a hospital bed, strapped in, and wires all plugged in to me. i wanted to know how long i had been there. appearently, it had been 4 days. the whole time my heart rate was going from 50 BPM to fucking 160 BPM. when i first got there i was in a catatonic or coma like state, unresponsive pupils (prolly from the dex), and some sort of condition that had to do with me drinking too much water (dilluting the sodium in my blood).
but thats just the physical.
4 days after the fact, and im still tripping. well, it was different, because i awoke from a coma tripping, so it was like being born again. i know this sounds strange, but alot of wierd ideas and concepts were entering my mind that were so totally alien, yet i was accepting them as truth and reality (DXM can REALLY fuck with your sense of reality. not so that you look at it, laugh and say "wow what a trip" but so that you actually QUESTION your concept of reality and how correct it is.). so picture me as some wide eyed zealot experiencing the world for the first time, and embracing every idea as fact.
anyway, not only that, but im hearing voices (they called it "Substance Induced Schizophrenia"), im seeing shit.... long after i stopped dosing, long after.
so my point is, if i can come back from a 2g trip and schizophrenia, and being some starry eyed retard who cant talk or think straight, to feeling better than i did before i started binging, i dont think any brain damage has been done, or ever will be done. all the DXM molecule does is bind to the N-methyl D-asperate receptor and block it. now with recreational use (not binging), those receptors remain blocked for a little less than a day. so after seeing no brain damage from having those same receptors blocked for a week, and you want to suggest the casual dexxer is at risk of a "holly brain"?
pfft...