Preheat an electric smoker to 350 degrees.

Drain and pat dry the Cornish hens and allow them to rest at room temperature for 30 minutes to an hour.

Add the salted butter, Jamaican curry seasoning, smoked sea salt, fresh thyme, and marjoram in a small bowl and melt the butter in the microwave.

Brush the Cornish hens generously with the butter and herb mixture.

Arrange the Cornish hens in aluminum pans and place them on the center rack of the smoker.

Adjust the temperature to 275 degrees and smoke the hens for 3 to 3 1/2 hours or until an instant-read thermometer reaches 165 degrees.

Remove the hens from the smoker and allow them to rest for ten (10) minutes.