By defining your ratio of a 2:1, that would be equal to 2 parts CBD to 1 part THC. In other words, if you had a 10mg CBD dose, of a 2:1, the THC would be 5mg. As far as the question of what strain of cannabis has the highest amount of CBD to THC, I am not sure I can absolutely answer that question. The high CBD strains I work with for Trokie products use a 3:1 ratio like Santa Cruz Tsunami or Clone 62, if you are looking to smoke or vape that strain in bud or concentrate form. Trokie is a buccal delivery system so it is delivered via your oral mucosa and not inhaled. We have a 1:1 ratio. There are many different strains out there with a broader range of ratios.