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Once it's cooked and heated (which I assume you're doing since it's added to a rub) you won't be able to taste it.
It's a great aromatic, and it's good sprinkled on eggs, French fries or anything else that you salt after cooking.
It won't hurt anything if you add it to your rub. I've smoked salt with hickory a few times, it smells great!! I've also bought the smoked salt in the McCormick grinder, I think it has a chemical smell to it.