Not necessarily, particularly depending on what you specifically want to treat. If you go poking around weedmaps.com (well, after their site starts functioning

Not necessarily, particularly depending on what you specifically want to treat. If you go poking around weedmaps.com (well, after their site starts functioning again :/), and look into strain-specific details there, there absolutely are low THC strains available, and also amazingly high THC level strains. High and low CBN/CBD, etc. In addition, they have some space dedicated to breaking out the main/known active contituents in MJ, and what they're believed best to affect.