A slang term for using a vaporizer to ingest THC, either for recreational use or as part of a medical treatment plan. Rizing is a homonym with "rising", which has connotations to getting high, as well as empowerment with respect to medical applications (cancer, glaucoma, chronic pain, etc.).
Hey Ker, let's rize up and put on some Marley! Rizing feels much better on my lungs than a macka spliff...