Because over the years cannabis has been selectively bred for potency and after medicalization/legalization more and more people got into breeding and we are now seeing the result of that.
Cocaine potency/purity is more a supply chain and greed thing. The closer you get to the source the higher purity it is, and lower the cost, generally.
Once cocaine is legalish like cannabis the price will steadily decline and the quality will increase substantially.
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