What can I do if got stop DUI for my car smelling weed and they took my car away?

Hire a DUI defense attorney. Just because your car smell like pot doesn't mean you are guilty of anything except taking your medicine in your car. Your medicine smells, most doesn't, but that's not illegal. If your car was impounded because you were driving without a license, on a suspended license or for a DUI the agency involved must have reasonable suspicion that a crime has been committed before getting involved with you and probable cause to arrest before you can be arrested. There may be more to your story but they can't impound your car because they smell weed, they need something more.

You may be able to get it back now, contact the police department to find out how to get it released.