Words in Germanic languages (Old English hænep, Old Norse hampr, and German der Hanf) go back to *hanap-, which by Grimm's Law would come from a *kanab- form, but this loanword preceded Romano-Germanic culture. A reconstructed PIE *b is evident in Latin cannabis (Vulgar Latin *can(n)abum, *canaba) from Greek kannabis, the earliest recorded term for the drug, which transcribed a Scythian or Thracian word.
Terms in Germanic languages (Old English hænep, Old Norse hampr, and German der Hanf) have their origins in *hanap-, which would be expected to come from a *kanab- form according to Grimm's Law, but this loanword occurred before the influence of Romano-Germanic culture. A reconstructed PIE *b is discernible in Latin cannabis (Vulgar Latin *can(n)abum, *canaba) from Greek kannabis, the earliest known term for the drug, which transcribes a Scythian or Thracian word.