The hide is dry already. Smoking is the last step in braintanning and is a curing method. The smoke impregnates aldehydes in the leather which ensures it will never go back to a harden rawhide state. It adds colour but this will fade over time and washing.
Do you have any resources you could point me to on brain tanning? This looks pretty neat.
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https://braintan.com/tanown/index.htm