What does cocaine have in common with other drugs?

Illegal drugs: Cocaine is a drug in itself, so most street drugs don't have cocaine in them, which is sold on its own. If people cut other drugs into pills, for instance, they aren't likely to put cocaine into the pill because it is much more expensive than others and they could get a better price for it on its own.

Legal drugs:

In the UK and US no legal drugs have cocaine in them. In the UK it's a Class A drug.