Modern cannabis strains are bred to be higher in THC and lower in CBD, potentially leading to increased edginess.

“So, it's stronger now. It's higher in THC because it's been >> crossbreed and cross like a dog. You know, you want a dog with a long nose. It's the same thing with plants. So, >> people want to get more bang for their buck. So, the breeders are trying to breed more THC into it. And sometimes this is not good for people because the CBD is kind of calmed down and balanced with the THC. Now the CBD is down and the THC is up there. So that's why it's more likely to make you feel a little edgy now because the THC is kind of active.”