I tend to take Wikipedia with a grain of salt when they describe psychoactive drugs. I'm really suprised you never got anything from Kanna unless snorting it. You obviously just got weak stuff. I know a vendor with quality Kanna for real cheal ($13 an oz) and you'd prob. find a few grams orally quite pleasant. I guess mixing any strange substances with DXM is a really bad idea, as DXM is known to have dangerous interactions with numerous drugs.
Over the years I've combined DXM with: MJ, Cid, HBW, K, MG, booze, blow, adderall, ephedrine, sudafed, coffee, piracetam, dmae, lecithin, dlpa, chocamine, rhodiola, Kratom, CoQ10, ALA/ALCAR, Wormwood hash, E, Japanese Sweet Flag 5X, Amanita pantherina, Psilocybe, Wellbutrin, Xanax, Wild Dagga, Soma, and prob. quite a few other substances...
I guess you guys will think I'm a suicidal fool if I do dare to combine Kanna with DXM... Then again, people on forums talk all the time about taking DXM while on SSRI's, despite the risks. I know from personal experience that DXM feels much more toxic and less enjoyable while on Effexor or Celexa.