Marinate the tofu: In a small bowl mix together the soy sauce, maple syrup, smoked paprika, garlic powder, and liquid smoke. Add the tofu to a sealable container or bag (make sure the container or bag is secure enough that you can flip it upside down without any liquid leaking out). Pour the marinade over the tofu and gently turn the container or bag to coat the tofu. Let marinate for a minimum of 15 minutes or up to 3 days in the fridge. If you are marinating it for a long time, I like to flip the container every now and then to ensure it marinates evenly. The longer you marinate it, the more flavorful it will become.