Can I bring back Cuban cigars into the U.S.?

Yes! You can bring back Cuban cigars to the U.S.! 

As of October 2016, the monetary value limitations on what authorized travelers may bring back to the United States as accompanied baggage has been removed. In other words, authorized American travelers may now bring back as much rum, cigars, artwork, etc. for personal use as they can fit in their luggage. Please see U.S. regulations on import good for non-personal use items.