ya its kickass drug. u can do it as often actually. some ppl do it everyday. dont know if its healthy tho. ask juggalo
Just search some of Juggalo420s posts, I mean...
http://boards.cannabis.com/showthread.php?t=12486
http://boards.cannabis.com/showthread.php?t=12902

This is probably not the kind of drug you want to be doing frequently. It may not visibly harm your body, but it obviously has addictive potential and fucks with your mind if you arn't careful.
http://www.erowid.org/experiences/subs/exp_DXM.shtml

Any more than twice a month, and you're at risk for Olney's Lesions. (Brain damage.)
There are no reported human cases of Olney's Lesions, William White has retracted some of his findings.
http://www.erowid.org/chemicals/dxm/dxm_health2.shtml
http://www.erowid.org/chemicals/dxm/dxm_health3.shtml