There may be a short circuit between conductors within the wiring harness or from the harness to chassis ground. Hopefully a fuse DID blow to prevent further damage. Whatever component produced the smoke needs to be replaced 'cause its likely shot. If you find and replace a blown fuse without first repairing the actual problem you will probably make the problem worse and still not be able to start the vehicle. Not to mention just blowing another fuse.
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