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You got it reversed. AFAIK, there are no federal laws prohibiting abortion but there are federal laws prohibiting the use and sale of cannabis. Some states chose to criminalize abortion, but not all do. And many states chose to basically ignore the federal laws on cannabis (I'm not sure exactly how that one works, to be honest).

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States aren’t required to enforce federal law, and the federal government can’t force states to help enforce federal law, as it’s unconstitutional.[1] If the feds want to enforce the marijuana ban and the state doesn’t volunteer to help, the feds would have to use e.g. the FBI or DEA to enforce the law. The feds don’t have the capacity to do that nationally, though, so it mostly goes unenforced, except maybe for large busts where it’s worth it for the feds to put the effort in.

[1] http://en.wikipedia.org/wiki/Commandeering#In_the_United_Sta...

>States aren’t required to enforce federal law

But Federal funds can, and are, withheld if the States don't enforce Federal Laws. EG: Universal 55 MPH speed limits & 21 yo drinking age come to mind.

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