Hi, welcome to the forum, as rightly stated by Nikodicreta, there is no specific medical term for cannabis allergy. We can simply term it as ' cannabis allergy' or ' allergic to cannabis'. Hemp is not used commonly in medical practice.
I hope this helps. Take care and regards.
Hemp is also a name for the Cannabis plant.
"Allergy to cannabis' should be sufficient info on your bracelet, since i haven't heard about hemp used in emergency medicine.
Blessings
Nikodicreta