Potency with THC is generally that the plants have been bred to have a higher percentage of THC in the bud. In 1970, the THC percentage was pretty low (like somewhere around 10%), today, you can get damn near 50% in a plant (numbers sourced from my ass). The chemical itself is the same, there’s just more of it. That’s what, on the whole, makes it more potent.
Latest Answers