Preheat oven to 425 degrees F and place a 9-inch cast iron skillet in the oven to heat it.
Mix milk and cornmeal in a small bowl. Set aside for 10 minutes.
Melt cannabis butter and butter together in the microwave or over low heat on the stovetop..
Sift flour, baking power, and salt together in a large bowl.
Use a wooden spoon to beat cornmeal mixture, eggs, and melted butters into flour mixture and mix until just combined.
Remove heated pan from the oven. Spread the oil over the bottom of pan, swirling pan to evenly coat the bottom and partially up the sides.
Pour the batter into the prepared skillet, smooth out the top, and bake until starting to brown and cake tester inserted into the center comes out clean, about 18 - 20 minutes. Let cool in skillet for 5 minutes before cutting into wedges and serving.