eli5. How has marijuana gotten so much more potent over the years but the opposite for cocaine?

Question

80’s coke is often talked about in songs/movies/ tv as being pretty wild stuff, where as marijuana is now
~4x more potent.

In: 12138

Answer 1

I think OP is trying to understand why plants with higher levels of THC have been developed but coca plants with higher levels of potency have not. I believe it is because with cocaine it is already 100% pure before it is cut with anything but different marijuana plants have different levels of the active ingredient, THC, and new strains are constantly being developed that have higher and higher levels of THC.