Back in the day, users thought that getting high was the ultimate goal, and many strains were grown to reduce CBD and increase THC. This would get you very high. Over the years as medical marijuana has become legal in more places, growers realized the medicinal potential was in the CBD. In Canada there are very specific labeling requirements on packaging, one of which is to give the amount of milligrams or percentages of each CBD and THC. Depending on your therapeutic needs, uses and experience, I would teach you how to figure out the best ratio to give you the best results for your individual needs.