Medical marijuana is the act of using cannabis for health and wellness reasons. So in answer to your question, once you are approved by a doctor to use cannabis for your medical concerns, you are able to use any type of cannabis product – with THC and CBD and anything else in-between.
Most cannabis products tend to have THC in them, even the high CBD ones. The reason is that the cannabinoids work together to create their effect. Therefore, even if you are looking for a high CBD product, you may still want to have a small amount of THC in it to create what is know as the ‘entourage effect’. Besides THC and CHD, there are lots of other cannabinoids that also work together to create this effect.